Chaim Kaufmann and Robert Pape, calculate that for sixty years Britain sacrificed an annual average of 1.8 percentage points of its GNP because of its moral commitment to ending slavery. That is an astonishing total, cumulatively amounting to more than an entire year’s GNP for Great Britain (for the United States today, it would be the equivalent of sacrificing more than $14 trillion), a significant and sustained sacrifice in the British standard of living. It was a heroic example of a nation placing its values above its interests.
