Slavery was a core part of civilization for most of history

What is the liberal arts?  The word arts means ‘subjects of study’ and today the word liberal in this context is usually taken to mean “wide-ranging” and “broad-minded”, but that wasn’t the original meaning of the term.  The liberal arts is an concept that can be traced back to ancient Rome and Greece.  Although academics have a reputation for being politically liberal, they are actually extremely conservative about conserving academic traditions and the liberal arts is one of our most conservative academic traditions, but the way that we define ‘liberal’ has changed from the original meaning which is fortunate because the original meaning reflected some of the intrinsic ugliness about ancient societies.  The phrase originally meant the kind of study (or “arts”) that free men need as opposed to unfree men.  The word “liberal” came from the Latin word for freedom and a the concept of the liberal arts has roots that go back at least to Aristotle who saw how slaveholders were liberated from work in order to be able to pursue the kind of arts that were literally “worthy of a free man” such as philosophy and science.I’ve used the term ‘man’ because women who rarely had as much freedom as men and Aristotle considered women to be unfree for the same reason that he thought that some people were ‘natural slaves’ in that he thought they were incapable of making their own decisions. 

Although the meaning of the term, ‘the liberal arts’, has changed, the original meaning illustrates how pervasive slavery used to be.  It was endemic in all early civilizations.  James C. Scott’s book, Against The Grain, argues that it was worse in large empires than in small-scale societies, and this would seem likely given the considerable evidence that inequality was larger in larger empires.  Scott speculates that hunter-gatherer societies had less slavery than agricultural societies and he quotes V. Gordon Childe’s book, Man Makes Himself which claimed that early civilizations that domesticated animals also applied the sample principles in developing slavery. 

“men as well as animals can be domesticated. Instead of killing a defeated enemy, he might be enslaved; in return for his life he might be made to work. This discovery has been compared in importance to that of the taming of animals… By early historic times slavery was a foundation of ancient industry and a potent instrument in the accumulation of capital.”

In modern civilizations, the state takes resources via taxation. In early civilizations, taxation was difficult because there was little surplus and money was rarely used by most people. Scott argues that grain production was essential to the rise of taxation because it was a standardized unit of production that was relatively easy to measure and confiscate. In essence, grain served as a kind of money for the purposes of measuring the value of production that states could tax.

[A] peasantry… will not automatically produce a surplus that elites might appropriate, but must be compelled to produce it. Under the demographic conditions of early state formation, when the means of traditional production were still plentiful and not monopolized, only through one form or another of unfree, coerced labor—corvée labor, forced delivery of grain or other products, debt bondage, serfdom, communal bondage and tribute, and various forms of slavery—was a surplus brought into being.

Each of the earliest states deployed its own unique mix of coerced labor, as we shall see, but it required a delicate balance between maximizing the state surplus on the one hand and the risk of provoking the mass flight of subjects on the other, especially where there was an open frontier.

Only much later, when the world was, as it were, fully occupied and the means of production privately owned or controlled by state elites, could the control of the means of production (land) alone suffice, without institutions of bondage, to call forth a surplus. So long as there are other subsistence options, as Ester Boserup noted in her classic work, “it is impossible to prevent the members of the lower class from finding other means of subsistence unless they are made personally unfree. When population becomes so dense that land can be controlled it becomes unnecessary to keep the lower classes in bondage; it is sufficient to deprive the working class of the right to be independent cultivators”—foragers, hunter-gatherers, swiddeners, pastoralists.

It was difficult to prevent slaves from escaping and returning to their home communities when they came from nearby. Male slaves were often chained or imprisoned in a work site at a mine or on a galley of a ship. Slaves were separated from their relatives and mixed with unrelated individuals often from other tribes that had no history of trusting one another. Differences in racial appearance could help the dominant race identify slaves and work together to dominate them such as in the American South, and there is some evidence that race played a role in the enslavement of hunter-gatherers by the first agricultural populations of Europe.  But in most of the ancient world there was usually little difference in physical appearance between slaves and owners and so race has rarely been a part of slavery. But tribalism and accent were often used as identifying factors at least for first-generation slaves until speech patterns assimilated in subsequent generations.  Seafaring powers like Athens and Rome typically brought slaves from multiple places across the Mediterranean which made escape back to home virtually impossible.

For slave raids closer to home it was common practice that:

The towns and villages of the defeated peoples were generally destroyed so that there was nothing to go back to. In theory, the plunder belonged to the ruler, but in practice the loot was divided up, with the generals and individual soldiers taking their own livestock and prisoners to keep, ransom, or sell.

For similar reasons, it was hard for European colonists to enslave Native Americans in North America.  They had an easy time slipping away back to native populations (plus, they were susceptible to numerous Old World diseases and kept dying off).  Native Americans were the first slaves but African slaves had a much harder time escaping and finding refuge in native communities and they were already resistant to disease so African slavery displaced Native American slavery in the South although there were still some Native American slaves into the 1800s.  The Spaniards had an easier time taking over the slave traditions of the Aztec and Incan empires where conscripted labor was already a well-established institution of empire.  Egypt had an easier time preventing runaways because it was surrounded by desert.

Scott says that early warfare was more often about capturing slaves than capturing territory. One obvious advantage of capturing slaves was that territory is harder to control than just some of the people of a territory and slaves were easier to transport than physical goods and furthermore, captured slaves were used as beasts of burden to carry goods too.

Warfare in [Mesopotamia] beginning in [3,500] and for the next two millennia was likewise not about the conquest of territory but rather about the assembling of populations…

Oddly, I was never taught in world history class about just how central slavery was to the civilizations we studied. For example, ancient thinkers that we respect, like Aristotle and the Apostle Paul, thought that slavery was natural and necessary because it was common nearly everywhere.

Slavery was not invented by the state. Various forms of enslavement, individual and communal, were widely practiced among nonstate peoples… [But it] would be almost impossible to exaggerate the centrality of bondage, in one form or another, in the development of the state until very recently. As Adam Hochschild observed, as late as 1800 roughly three-quarters of the world’s population could be said to be living in bondage.9 In Southeast Asia all early states were slave states and slaving states; the most valuable cargo of Malay traders in insular Southeast Asia were, until the late nineteenth century, slaves…

Moses Finley famously asked, “Was Greek Civilization based on Slave Labour?” and answered with a resounding and well-documented yes.11 Slaves represented a clear majority—perhaps as much as two-thirds—of Athenian society, and the institution was taken completely for granted; the issue of abolition never arose. As Aristotle held, some peoples, owing to a lack of rational faculties, are, by nature, slaves and are best used, as draft animals are, as tools. In Sparta, slaves represented an even larger portion of the population. The difference… was that while most slaves in Athens were war captives from non-Greek-speaking peoples, Sparta’s slaves were largely “helots,” indigenous cultivators conquered in place by Sparta and made to work and produce communally for “free” Spartans…

Imperial Rome… turned much of the Mediterranean basin into a massive slave emporium. Every Roman military campaign was shadowed by slave merchants and ordinary soldiers who expected to become rich by selling or ransoming the captives they had taken personally. By one estimate, the Gallic Wars yielded nearly a million new slaves, while, in Augustinian… Italy, slaves represented from one-quarter to one-third of the population. The ubiquity of slaves as a commodity was reflected in the fact that in the classical world a “standardized” slave became a unit of measurement [of value].

Thus slaves were so common in the Roman marketplace that they served one of the core functions of money for wealthy Romans. Slaves were also a measure of status and wealth.

…If the elite households of Greece or Rome are any indication, a large part of their claim to distinction was the impressive array of servants, cooks, artisans, dancers, musicians, and courtesans on display.

We don’t have much documentation showing the percent of ancient Mesopotamia that was enslaved partly because slaves were more like domesticated animals than people and there was no more effort to record the census of domesticated animals than to record the populatoin of slaves. Scott says slaves were, “wholly equivalent to domestic animals in status.” Surviving written documentation is scarce after so many thousands of years, but one of the few records that exists is for the city of Uruk

Slavery [in ancient Mesopotamia], while hardly as massively central as in classical Athens, Sparta, or Rome, was crucial for three reasons: it provided the labor for the most important export trade good, textiles; it supplied a disposable proletariat for the most onerous work (for example, canal digging, wall building); and it was both a token of and a reward for elite status…

The most unambiguous category of slaves was the captured prisoner of war. Given the constant need for labor, most wars were wars of capture, in which success was measured by the number and quality of captives—men, women, and children—taken…

[In Uruk there were] state-supervised workshops producing textiles that engaged as many as nine thousand women. They are described as slaves in most sources but also may have included debtors, the indigent, foundlings, and widows—perhaps like the workhouses of Victorian England. Several historians of the period claim that both women and juveniles taken as prisoners of war, complemented by the wives and children of debtors, formed the core of the textile workforce. Analysts of this large textile “industry” stress how critical it was to the position of elites, who were dependent for their power on a steady flow of metals (copper in particular) and other raw materials from outside the resource-poor alluvium. This state enterprise provided the key trade good that could be exchanged for these necessities. The workshops represented a sequestered “gulag” of captive labor that supported a new strata of religious, civil, and military elites. Nor was it insignificant demographically. Various estimates put the Uruk population at around forty thousand to forty-five thousand in the year 3,000 BCE. Nine thousand textile workers alone would represent at least 20 percent of Uruk’s inhabitants, not counting the other prisoners of war and slaves in other sectors of the economy…

slaves and prisoners of war… were not well treated. Many are shown in neck fetters or being physically subdued. “On cylinder seals we meet frequent variants of a scene in which the ruler supervises his men as they beat shackled prisoners with clubs.”21 There are many reports of captives being deliberately blinded, but it is impossible to know how common the practice was. Perhaps the strongest evidence of brutal treatment is the general conclusion by scholars that the servile population did. not reproduce itself. In lists of prisoners, it is striking how many are listed as dead—whether from the forced march back or from overwork and malnutrition is not clear.22 Why valuable manpower would be so carelessly destroyed is, I believe, less likely to be owing to a cultural contempt for war captives than to the fact that new prisoners of war were plentiful and relatively easy to acquire…

Plus, brutality was a way to motivate slave labor and a tool of control to prevent slave rebellion.

[In China, both the Qin dynasty and the Han dynasty had] markets for slaves in the same way as it had markets for horses and cattle. In areas outside dynastic control, bandits seized whomever they could and sold them at slave markets or ransomed them. The capital of both dynasties was filled with war captives seized by the state, by generals, and by individual soldiers. As with most early warfare, military campaigns were mixed with “privateering,” in which the most valuable loot comprised the number of captives who could be sold. It seems that much of the cultivation under the Qin was carried out by captive slaves, debt slaves, and “criminals” condemned to penal servitude…

slavery, [usually] in the form of war captives… had several advantages over other forms of surplus appropriations. The most obvious advantage is that the conquerors take for the most part captives of working age, raised at the expense of another society, and get to exploit their most productive years. In a good many cases the conquerors went out of their way to seize captives with particular skills that might be useful—boat builders, weavers, metal workers, armorers, gold- and silversmiths, not to mention artists, dancers, and musicians…

Women [of reproductive age] and children were particularly prized as slaves. Women were often taken into local households as wives, concubines, or servants, and children were likely to be quickly assimilated, though at an inferior status. Within a generation or two they and their progeny were likely to have been incorporated into the local society—perhaps with a new layer of recently captured slaves beneath them in the social order. If manpower-hungry polities like, say, Native American societies or Malay society historically are any indication, it is common to find pervasive slavery together with rapid cultural assimilation and social mobility. It was not uncommon, for example, for a male captive of the Malays to take a local wife and, in time, organize slave-taking expeditions of his own. Providing that slaves were constantly being acquired, such societies would remain slave societies, but, viewed over several generations, earlier captives would have become nearly indistinguishable from their captors. Women captives were at least as important for their reproductive services as for their labor. Given the problems of infant and maternal mortality in the early state and the need of both the patriarchal family and the state for agrarian labor, women captives were a demographic dividend. Their reproduction may have played a major role in alleviating the otherwise [high mortality rate of Malthusian societies]…

As earlier captives and their progeny were incorporated into the society, the lower ranks were constantly replenished by new captives, further solidifying the line between “free” subjects and those in bondage, despite its permeability over time.

One reason for the fluid nature of class structure in which slaves could become free was the common interbreeding between elite men and their female slaves who were sometimes even elevated to the status of concubine or wife. Plus, the elite property owners were always wanting more laborers which died off at a fast rate in given that average life expectancy for most of history was in the low 30s.  They had to constantly replace laborers who died off from malnutrition, sickness, and abuse.

I cannot resist the obvious parallel with the domestication of livestock, which requires taking control over their reproduction. The domesticated flock of sheep has many ewes and few rams, as that maximizes its reproductive potential. In the same sense, women slaves of reproductive age were prized in large part as breeders…

As for male slaves, they were often separated from the women and children and sent to do other work:

in the Greco-Roman territories they were deployed as a kind of disposable proletariat in the most brutal and dangerous work: silver and copper mining, stone quarrying, timber felling, and pulling oars in galleys. The numbers involved were enormous, but because they worked at the sites of the resources, they were a far less visible presence—and far less a threat to public order—than if they had been near the court center. It would be no exaggeration at all to think of such work as an early gulag, featuring gang labor and high rates of mortality. Two aspects of this sector of slave labor deserve emphasis. First, mining, quarrying, and felling timber were absolutely central to the military and monumental needs of the state elites…

There is a good chance that any time you see a monumental work of architecture or from the ancient world that it was mostly constructed with slave labor.  Remember that the next time you see the Acropolis of Athens, pyramids of Giza, the Great Wall of China, Roman ruins, Venetian palaces, or any other tourist attraction that was built before the 19th century.

The luxury of having a disposable and replaceable [workforce] is that it spared one’s own subjects from the most degrading drudgery and thus forestalled the insurrectionary pressures that such labor well might provoke, while satisfying important military and monumental ambitions. In addition to quarrying, mining, and logging, which only desperate or highly paid men will undertake voluntarily, we might include carting, shepherding, brick making, canal digging and dredging, potting, charcoal making, and pulling oars on boats or ships.

Thus, a slave population also secured the ruling elites in their power by simultaneously elevating a class of supporters who owned the slaves and although they might have to pay taxes or tribute to the elites at the top of the hierarchy, at least they were spared the drudgery of producing the tax by having their own slaves.

Max Weber’s concept of “booty capitalism” seems applicable… “Booty capitalism” simply means, in the case of war, a military campaign the purpose of which is profit. In one form, a group of warlords might hatch a plan to invade another small realm, with both eyes fixed on the loot in, say, gold, silver, livestock, and prisoners to be seized. It was a “joint-stock company,” the business of which was plunder. Depending on the soldiers, horses, and arms that each of the conspirators contributes to the enterprise, the prospective proceeds might be divided proportionally to each participant’s investment. The enterprise is, of course, fraught, in as much as the plotters (unless they are merely financial backers) potentially risk their lives… In many cases—in early Southeast Asia and in imperial Rome—war was seen as a route to wealth and comfort. Everyone from the commanders down to the individual soldier expected to be rewarded with his share of the plunder.

In my history classes, slavery was treated as a peculiarly American phenomenon, but as Thomas SowellStanley L. Engerman and many other scholars have pointed out, slavery was practiced on every inhabited continent throughout history.  Until a couple centuries ago, most people accepted slavery as natural or inevitable.  Slavery took many different forms in different societies. The North Atlantic slave markets were unusual in that capitalism was just taking off for the first time which created new kinds of slavery businesses and the racist chattel slavery that arose was harsher than many other forms.  Jeremy Black argues that totalitarian societies like the USSR and Communist Cambodia made widespread use of large-scale state-sponsored slavery right into the latter part of the 20th century through their gulag “work camps” where prisoners were forced to work without pay, many without hope of manumission.  Similarly, after slavery was banned in the US, the Jim Crow South re-enslaved a remarkable percentage of their Black community by imprisoning them often on false pretenses and using prisoners for forced labor.

Today slavery is illegal everywhere for the first time in human history

The last countries to abolish it were Saudi Arabia in 1962, and Mauritania in 1980. This graph by Stephen Pinker shows when it happened:


There have always been some individuals who have had moral qualms about slavery, but it was considered good or at least normal by the most powerful people in nearly every country in the world until a couple centuries ago. 

Although slavery is universally condemned today, it still lives on according to a National Geographic article about “21st Century Slaves“:

There are an estimated 27 million men, women, and children in the world who are enslaved — physically confined or restrained and forced to work, or controlled through violence, or in some way treated as property.

Therefore, there are more slaves today than were seized from Africa in four centuries of the trans-Atlantic slave trade [11 million total, and about 450,000, or about 4% of the total, who were brought to the United States]. The modern commerce in humans rivals illegal drug trafficking in its global reach—and in the destruction of lives.

This map shows where slavery is the most prevalent in the 21st century:


In theory slavery should be more profitable today than ever before because wages are MUCH higher than the cost of subsistence whereas for most of history it cost about the same amount to pay for a subsistence wage laborer as to feed a slave (unless the slave was being worked to death which was also common).  The fact that wages in the slave states of the US were among the highest in the world was one of the economic incentives for slavery there.  It saved a lot of money relative to paying a wage.  The fact that wages are so much higher today than in Malthusian times helps explain why slavery still exists despite universal approbation. 

Why did slavery finally get banned everywhere in the world?

Mr. Black argues that capitalism ultimately led to a dramatic reduction in slavery, but this is misleading because capitalism enthusiastically exploited slavery and made it more entrepreneurial, monetized, and globalized.  Before capitalism, slavery was usually more about one’s place in a social hierarchy.  In tribal-based societies, someone who didn’t have strong connections to a family might need to be a slave just to survive, but slaves could eventually rise in status (like in the Biblical story of Jacob) by proving loyalty and worth to the family.  A slave’s status often functioned on a continuum with roles in a family hierarchy and might not be very different from the status of biologically-related women in some societies.  In some societies, high-status slaves could themselves own other slaves!

So if capitalism did not lead to the global abolition movement, what did?  Ultimately it was the increase in bargaining power of workers to demand greater wages and rights.  The same factors that eliminated slavery also caused rising wages and working conditions for ordinary people.  What increased the bargaining power of workers?

1. Physical capital accumulation.

Mr. Black gets partial credit for naming capitalism because capitalism did help produce capital accumulation, but capitalism also produced the vast international slave trade and massive monocultures of chattel slavery in the production of American cotton, sugar in the Caribbean and Brazil, dates and pearls in the Persian Gulf, and many other examples.

To understand how capital led to the abolition of slavery, we have to define capital in a specific way.  The broadest definition of capital is simply wealth and slaves were the dominant form of wealth in wealthy slave societies, so the accumulation of wealth alone did not cause the abolition movement.  For example, slaves accounted for almost 1/3 of the total wealth of the United States at the time of the American Revolutionary War and approaching half of total wealth in the slave states.


The definition of capital I’m using here is “PHYSICAL capital” (as opposed to human capital or financial capital or natural capital, etc.).  Physical capital is something that is produced at a sacrifice that makes you more productive.  In other words it is our tools, machinery, and infrastructure.   Physical capital is valuable in proportion to the difficulty of producing it and it is always easier to destroy it than to create it (due to the 2nd law of thermodynamics).

That ease of destruction gives workers more bargaining power.  A new bulldozer that costs $200,000 can easily be sabotaged by disgruntled workers with a little sugar in the gas tank or a little sand in the gearbox or a little nick on a radiator hose which can result in tens of thousands of dollars in repair costs and it will be very hard to figure out who caused the problem.  Valuable physical capital gives workers more leverage because owners really don’t want disgruntled workers with nothing to lose.

2. Complex work

The more complex an economic system is, the more decisions each worker must make.  Decisions require autonomy which is the opposite of slavery.  Plus, psychologists have known since 1908 that too much extrinsic pressure leads to worse decisions because people clutch.  The only kind of work that responds well to extrinsic pressure is routine work like digging ditches.  When even rudimentary cognitive skill or creativity is required, extrinsic pressure tends to lead to worse performance.

3. Interdependent work with potential to sabotage a production process

When a cotton-picking slave does poor work, it has little effect on the productivity of anyone else.  But when one assembly-line worker does poor work, it reduces the productivity of all the other workers on the same line by the same amount.  For example, the speed of an entire assembly-line is determined by the slowest worker and if anyone slows down, that slows everyone down.  Similarly, if just one person makes an error which causes the product to be defective, it doesn’t matter if everyone else does perfect work.  The product is still worthless.  Each person whose job is a kind of bottlenecks in a production process has leverage for bargaining for more money.

4. Difficult to measure performance

In many jobs, it is hard to measure whether someone is working hard or not.  When it is impossible to monitor someone’s work, it is impossible to use extrinsic motivation and intrinsic motivators become more important.

Scott points out that the difficulty in measuring output was the reason why empires could only begin in places with highly-productive grain agriculture because it was too hard for central management to tax other kinds of production.  Scott says grain production was uniquely easy to tax in the ancient world (although woven textiles were similarly easy to tax) and these activities were also amenable to slave production because output was relatively easy to measure and extract. 

5. Other management methods have become more efficient

Powerful people can use force (slavery), payment or leadership to motivate people below them in a social hierarchy.  In primitive economies with little monetary exchange, payment was difficult to arrange, and leadership persuasion was limited to the number of people who could listen in the same physical space, so force & slavery was relatively more important. Nassim Taleb argues that Roman elites preferred slaves for important tasks like taking care of large estates because slaves could be tortured if the task wasn’t done well and employees literally had less skin in the game. But there are more ways to motivate workers nowadays and it was never clear that torture was ever the best way to motivate workers.  That is why some slave owners didn’t torture their slaves; some even paid their slaves a wage.

But the increasing monetization of economic activity has changed everything.  It made it feasible to tax more and more activities which has facilitated the growth of governments, and in parallel, it has also made it possible to create large hierarchical organizations like corporations that motivate workers through monetary wages.  Money is a better motivator for most modern production than slavery.

The advent of mass communication technologies beginning with the printing press have made it easier to influence and coordinate masses of people through verbal persuasion too. Educational systems create habits of obedience and norms of compliance in workers.  Mass communication technologies and monetization created alternate routes of influence that diminish the utility of using force.   

5. Other factors?

I’m probably missing something.  Send me an email if you think of more.

When slavery was legal, its profitability in some occupations and unprofitability in others helped explain why it was more likely to exist in some places and occupations than others.   For example, David Friedman argued (in chapter 15) that slavery wasn’t profitable in Britain and France during the period when it was taking off in the American colonies and even in the American colonies, it was only profitable for some crops like cotton and much less profitable in others like tobacco.  Britain tried using prisoners to do forced labor in maintaining the Thames River, but the value of their labor was less than the cost of maintaining the prisoners.  Whereas France succeeded in using forced labor for galley rowers, when they tried using slaves in the arsenal at the port of Marseilles, the practice wasn’t profitable enough to spread.  Wages in Europe were lower than in the Americas which meant that slavery was more profitable in the Americas, but slave labor was only profitable if it was cheap to keep slaves from escaping (such as on the galley of a ship) and easy to measure if they are working hard (also simple on a galley).  In most circumstances, it was cheaper to just hire someone for a wage.  Indeed, slave owners sometimes decided to pay their slaves a wage in addition to the threats of force to give more incentives for them to work harder in some kinds of jobs. 

In the northern part of the United States, slavery didn’t work as well because there was more physical capital in factories and motivating using force didn’t work as well in northern industries as in the cotton industry in the South. 

Was slavery so highly productive that we owe a debt of gratitude to slaves?

The legacy of slavery is underdevelopment, not wealth. Some proponents of race-based reparations for slavery argue that we all owe a debt of gratitude to slaves of yore for bequeathing us the prosperity we have today. They are correct that we do owe a debt of gratitude to all our forebears for what they have left us, but there is no evidence that anyone is better off today because of slavery except those individuals who directly inherited slave wealth.

[And there is no reason to pretend that slavery was an awesomely productive economic system to justify reparations. For example, European Jews didn’t argue that the holocaust was an awesomely productive economic system and they still got reparations.]

The idea that slavery was more productive than wage labor was first promoted by slave owners themselves as part of their justification for owning slaves. During the American Civil War, they warned that the world’s textile industry would collapse without the cheap cotton that slave plantations produced.

That didn’t happen. Yes, there was a dramatic spike in American cotton prices due to the war, but then prices went back to about the same and the global textile industry just kept chugging along, post slavery, even better than before.

Real cotton prices adjusted by GDP Deflator (Base 1 in 1800)
Karl Smith

It turns out that whereas wage labor (and small farm output) was less profitable for rich plantation owners, it didn’t have much effect on cotton buyers because slave labor wasn’t more productive.

Actually, a history of extractive institutions like slavery seems to have created a lingering curse because areas that had more slavery tend to be poorer today than areas that abolished slavery sooner. That is true of states in America as well as regions of the globe. When Russia abolished serfdom (a medeval form of slavery), productivity soared.

My former professor, Dierdre McCloskey argues correctly that if slavery was the key to American prosperity as some people claim today, then other societies that had more slavery for longer should be even more prosperous today than America, but that isn’t the case:

outright slavery was the practice of African kingdoms long before the British or even the Portuguese knew anything about them. True, the Atlantic slave trade gave the African kings a profitable market in which to sell their fellow Africans… The East African slave trade, note, was as large as and lasted longer than the West African one. Yet it did not cause an enriching “capitalism” to flourish in the Middle East. The Barbary pirates and their North African allies and competitors enslaved European sailors or the victims of coastal raids in large numbers for hundreds of years, yet no Great Enrichments ensued there. The very word “slave,” of course, comes from “Slav,” those enslaved on the east side of the Holy Roman Empire and seized by Mongols in the Golden Horde north of the Black Sea and sold into the markets of Constantinople/Istanbul. No Enrichment…

[Slaves were never super profitable in America because they were not particularly cheap labor.] To think so is to get the accounting and the economics wrong. Slaves required food [shelter and clothing], as a tractor requires fuel. A slave in Charleston in 1860 sold for three times the average workingman’s annual in­come… So, as economic historians pointed out long ago, the profits from the West African trade stayed in Africa.

Obviously not all slave profits stayed in Africa, but McCloskey’s point is that when the King of Benin sold slaves to Western traders, that should have been very profitable for him (and other African slave dealers) and McCloskey argues that it was the initial enslavement that was the most profitable part of the supply chain.

If slavery had been the source of American prosperity, then other places that practiced slavery in the 1800s like Africa and the Middle East should also be prosperous today, but they are not. The big accomplishment in economic development was the industrial revolution and that happened in large part because of high wages, not the low wages of slavery. If slavery had been legal and widespread in England on the eve of the industrial revolution, there would not have been the incentive to have the industrial revolution because slaves would have been cheaper than machines like they were in most of the world at that time. England had some of the highest wages in the world when they invented the industrial revolution and that created a big incentive to produce labor-saving machines. High wages also meant that ordinary people had more money to invest in wide-spread education and experimenting which helped boost the scientific revolution too. None of that would have been likely to happen if England had been a slave society like the American South where aristocrats spent their time worrying about how to prevent slave revolts rather than worrying about how to apply new engineering technologies to save money on high labor costs. The American South lagged behind the North in education and science.

Indeed, one of the theories for why the Roman Empire didn’t have an industrial revolution is because it was so dependent upon slavery which meant that Roman entrepreneurial talent focused more upon how to extract more work from slaves rather than thinking about developing technologies that reduce the work of laborers.

In short, slavery was nearly universal for most of history (in societies that left a written record) and so we are all descendants of slaves if you go back far enough. Slavery was always immoral and there has never been much benefit to anyone except the wealthy owners. The only beneficial legacy of slavery are some ancient monuments that might not have otherwise been built without slavery because they were too inefficient to justify the cost without free labor. Slavery is not the source of modern prosperity. If it were, then Egypt would be fabulously wealthy with its string of ancient monuments and long history of slavery stretching back to Biblical times, but Egypt is a poor nation. If anything, there is a negative correlation between a history of slavery and modern prosperity.

Posted in Development
One comment on “Slavery was a core part of civilization for most of history
  1. […] that what is truly ethical changes (unless you are a hard-core moral relativist).  Just because slavery was accepted by most societies for most of history doesn’t mean that slavery is usually […]

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