For example, it used to be that banks were prohibited from competing with the companies they loaned money to. After all, if you borrow money from Chase to open a pizzeria, and then Chase opens a pizzeria of its own across the street, you can see how your business would be doomed. You have to make interest payments to Chase, and your rival doesn't, and if Chase wants to, it can subsidize that rival so it can sell pizzas below cost until you're out of business.
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