>>7
Well let's look at this realistically, not everyone would end up in a debtor's prison. If a bank feels the individual can earn more outside of prison they may strike up a deal that suits them both, only those that could earn more profit in a debtor's prison or whom they fear may flee the country due to the size of their debt will end up there.
Around 10 million people would need to be incarcerated initially which will reduce as time goes on. Their revenue could be used to pay for the expenditure needed to pay for their cost of capture, legal processing, guarding and living resulting in profits of around $10000 to $15000 per person if they work 14 hour days everyday which goes to repay their debt.
For those who can earn more than $10000 profit for their bank they must prove they can do so by moving closer to their place of work to economical accomodation and make payments on time of face debtor's prison. They will also have to pay their share for the law enforcement needed to process them which will be less than that needed to keep them in a debtor's prison if they comply without adding any unnecessary additional bureaucracy and police time.