I can summarize. in a purely free market people won't want to do business with people who violate others' property rights since you have no guarantee they won'

I can summarize. in a purely free market people won't want to do business with people who violate others' property rights since you have no guarantee they won't violate yours. traditionally, guarantees against this have been ethnic. "well I know he won't enslave me since the norm is to only enslave blacks, therefore we can both happily profit from the slave trade and are no threat to each other."