I tend to agree with you about there being a distinction between unpaid and paid slavery, however I am not sure it's as useful or as clear a distinction as you imply.
For example - one way in which slaves can be held captive is by having them work in a remote place where they don't have the resources to travel across the space between them and the rest of society - e.g. A camp in the desert, or jungle, or a plantation on an island.
It is not clear why this kind of captivity is distinct from the captivity that arises when the barrier to cross is economic and social rather than physical.
If people are being used as laborer a in a position where they cannot accumulate enough resources to leave, what difference does it make what kind of wall keeps them there?
For example - one way in which slaves can be held captive is by having them work in a remote place where they don't have the resources to travel across the space between them and the rest of society - e.g. A camp in the desert, or jungle, or a plantation on an island.
It is not clear why this kind of captivity is distinct from the captivity that arises when the barrier to cross is economic and social rather than physical.
If people are being used as laborer a in a position where they cannot accumulate enough resources to leave, what difference does it make what kind of wall keeps them there?