Agreed, what about communities where marriage is extremely strict or are arranged? -they essentially cannot leave -they must work or can be beaten -they cannot go out alone -money is often exchanged in the marriage process This meets all the listed criteria for slavery. No black and white (pun not intended, but it works) definition that can be used, so any quantification is subjective. On the subject of prison labor, just after the civil war many southern states used trumped up charges to essentially enslave the newly "free."