What made it possible for some slaves to be able to buy their freedom?
Slaves began an underground trade in goods.
Some slave owners gave slaves an allowance.
The increased demand for labor gave slaves more power.
Taxes were collected from slave owners to provide funds for slaves.
The answer is, 'some slave owners gave slaves an allowance'
While it was very rare, a few slaves owners gave their slaves allowance for doing work on their plantations, the allowance wasn't big and it often took years for slaves to buy their freedom.
