… is from page 265 of Deirdre McCloskey’s 2010 Bourgeois Dignity; here, Deirdre is referring to the remarkable increase, over the past couple of centuries, in the productivity of bourgeois economies:
Exploiting the workers, to repeat, like overseas imperialism, does not yield enough loot to explain rises of 100 percent, not to speak of 1,500 percent, in the productivity of all – including paradoxically the exploited workers themselves.