By what class of people is the slavery of the Africans and their descendants supported and encouraged?

Q. 10. By what class of people is the slavery of the Africans and their descendants supported and encouraged?

A. Principally by the purchasers and consumers of the produce of the slaves’ labour; as the profits arising from the produce of their labour, is the only stimulus or inducement for making slaves.
~ Elias Hicks (1814)