vassalage

Among other possibilities, money was invented to make it possible for a foolish man to control wise men; a weak man, strong men; a child, old men; an ignorant man, knowledgeable men; and for a dwarf to control giants.

Many if not most slaves would have each readily jumped, and many if not most slaves would each readily jump, at the opportunity to be a master, if such an opportunity presents or had presented itself.