No one breaks down the internal operations of the finance sector like McKenzie. His latest edition, "Credit card debt collection," is a fantastic read:
https://www.bitsaboutmoney.com/archive/the-waste-stream-of-consumer-finance/
McKenzie describes how a debt collector who mistook him for a different PJ McKenzie and tried to shake him down for a couple hundred bucks, and how this launched him into a life as a volunteer advocate for debtors who were less equipped to defend themselves from collectors than he was.
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