What happened to slaves who went unsold?

by KingPeanutButter
TheJucheisLoose

Any particular time period/location you're referring to here? Antebellum South, or Classical Rome, or Yuan Dynasty China, or elsewhere?

AnOldHope

As you do not specify a time period, this is a throughout history question. Such questions are against our rules. However, please feel free to resubmit specifying which period you are interested in.