It has become a common trope that slavery and the slave trade is responsible for the industrial revolution, if not our entire modern prosperity. Slavery is often called capitalism’s “dark side.” A recent column in the Guardian claimed the slave trade “heralded the age of capitalism” and Guardian columnist George Monbiot said on Twitter: “The more we discover about our own history, the less the ‘trade’ on which Britain built its wealth looks like exchange, and the more it looks like looting. It meant extracting stolen resources and the products of slavery, debt bondage and land theft from other nations.” The same line has been taken by London Mayor Sadiq Khan, who tweeted: “It’s a sad truth that much of our wealth was derived from the slave trade.” But what did the “father of modern economics,” Adam Smith, actually think about slavery? And is it responsible for our modern prosperity? Adam Smith argued not only that slavery was morally reprehensible, but that it causes economic self-harm. He provided economic and moral ammunition for the abolitionist …