RT by @NigelBiggar: Its impact on the industrial revolution is a contested area (I studied this at Uni). But whether or not, that does not diminish Biggar's argument that slavery was normal and that it is abolition that is exceptional.

Its impact on the industrial revolution is a contested area (I studied this at Uni). But whether or not, that does not diminish Biggar's argument that slavery was normal and that it is abolition that is exceptional.