Imagine a situation where a substantial area is run by a heavy-handed organized crime group. Those at the top of the organized crime pyramid live like royalty, with palatial housing and the highest-end food, drink, and clothing. Those who live in this area pay for this luxury in a variety of ways: payoffs for starting or running a profitable business, limits on jobs, higher higher prices for goods and services, and an ongoing shadow of violence.
Now imagine that someone argued that organized crime was a great success for the for the local economy. For evidence, this person adds up the value of economic activity within the organized crime empire, and points to the high incomes, wealth, and political influence of the organized crime leaders.
But of course, the fact that this hypothetical organized crime organization makes money, especially for its leaders, doesn’t make it economically beneficial. Similarly, the fact that slavery was the basis for a larger agriculture economy and was profitable for slaveowners doesn’t make it economically beneficial, either. To know if something is “beneficial,” one needs to engage in what economists call “counterfactual” reasoning: that is, what would the economy have looked like otherwise?
As a first example of one way to make this comparison, Hoyt Bleakley and Paul W. Rhode consider “The Economic Effects of American Slavery, Redux: Tests at the Border” (June 2024, NBER Working Paper 32640). They take inspiration from the famous voyage of Alexis de Tocqueville and Gustave de Beaumont to America in 1831-32. When they were travelling down the Ohio River, with the free state of Ohio on one bank and the slave state of Kentucky on the other bank, it seemed obvious that the Ohio side was flourishing, while the Kentucky side was not. De Tocqueville wrote (translated from the French): “It is impossible to attribute those differences to any other cause than slavery. It brutalizes the black population and debilitates the white. One can see its deathly effects, yet it continues and will continue for a long time. […] Man is not made for servitude.”
Many analyses of slavery look at state-level or regional-level averages of South vs. North. Instead, Bleakley and Rhode focuses on a long narrow stretch of land on both sides of the border between free and slave states. They write: “We take the testing ground of de Tocqueville and de Beaumont — the upper Ohio River valley– and extend the comparison east to cover the borders dividing Pennsylvania and New Jersey from Virginia, Maryland and Delaware and west to contrast free states of Illinois and Iowa with the slave state of Missouri. The border was the dividing line between slavery and free labor institutions within the same
country, with a common language, national laws, and shared heritage.”
The pattern they find is that land is only about half as likely to be utilized on the slave side of the border; on the free side, investments in land-clearing and farm buildings were much higher. This represents a dramatic reduction in potential economic output in slave states–extreme enought that it was visible from the deck of ships going down the Ohio River. (And yes, the authors also do roughly a gazillion statistical checks to see if the results might be accounted for by soil erosion, river access, soil composition, timing of earlier settlement, earlier glacial coverage, the existence of state borders, and more.)
So why didn’t free labor move across the border to the available land in the slave states? Bleakley and Rhode emphasize that a slave society was dominated by rich slaveowners, who were focused on their own source of wealth. These states did not invest in infrastructure or institutions to benefit the middle- and lower-class of free workers; instead, they were likely to impose requirements that free workers participate in the enforcement of slavery. Slave-owning states were much more likely to have institutions that also affected free whites: indentured servitude, public whippings, debt bondage (in which someone in debt is legally required to work for another until the debt is repaid–which had a nasty habit of taking a very long time), or the leasing of prisoners to private companies as forced labor. The slaveowners’ idea of “property rights” was very much about their own personal property, not anyone else’s. For free labor, the political, economic, and social institutions of slave-owning states were largely unattractive. The authors quote a 1854 speech by Abraham Lincoln, who said that “slave States are places for poor white people to remove FROM; not to remove TO. New free States are the places for poor people to go to and better their condition.”
An alternative way of comparing slavery to Emancipation can be done with statistical modelling. Treb Allen, Winston Chen, and Suresh Naidu take this approach in “The Economic Geography of American Slavery” (NBER Working Paper 34356, October 2025). They use data from the 1860 Census to build ” assemble a comprehensive dataset of the spatial and sectoral distribution of economic activity in the U.S. in the year 1860.” This includes a division into agricultural, manufacturing and service sectors, along with data on measures of output, wages for free workers, prices of slaves, whether the area was likely to have malaria infestations, and much more.
The model then allows a thought-experiment: what if the enslaved workers and their families were emancipated? Where would they relocate, and in what sectors would they work? The authors write: “Combining theory and data, we then quantify the impacts of slavery. We find that complete emancipation has large effects on the U.S. economy, inducing an expansion of manufacturing (26.5%) and services (21.0%) and a contraction of agriculture (-5.4%). The welfare of formerly enslaved workers increases by almost 1,200%, whereas free worker welfare declines 0.7% and slaveholders’ profits are erased.” In their calculations, Emancipation causes overall GDP to rise by 9.1%.
Of course, the authors can then compare the effects of Emancipation in their statistical model with the actual effects of Emancipation after the Civil War: “Finally, we show that the counterfactual changes in labor allocations from emancipation are strongly correlated with observed patterns of White and Black reallocations across all sectors following the Civil War, although the comparison offers suggestive evidence of substantial migration frictions for recently emancipated Black workers.” In other words, the statistical model allowed former slaves to reallocate quite easily, and it wasn’t in fact that easy, so the actual economic effects would have been smaller than the model predictions–but in the same direction.
In the lead-in to the US Civil War, it was common to hear arguments from the pro-South side that slavery had been essential to the growth of the US economy. This argument has been resuscitated in recent years, but has received a markedly unamused response from scholars in the field. The pro-North side argued that the US economy would do just as well, or better, without slavery. These studies, and others, help to explain why that argument was correct. Back in 1804, after Napoleon damaged his own political reputation by executing a political opponents, one commenter remarked: “It’s worse than a crime; it’s a mistake.” In a similar spirit, one might say that slavery was not just a moral abomination; it was also an inefficient and low-growth economic outcome.





















