alt Hacker News> Price discrimination (charging people more who can afford more) can be good for low-income customers.
Unfortunately it doesn't work out that way. Consider banks, for example. As a relatively wealthy person, I don't pay fees for practically anything. On the contrary, banks pay me in the form of new-account signup bonuses, interest-bearing checking accounts, ATM fee reimbursements, etc.
Poorer bank customers, on the other hand, are continuously getting nickeled-and-dimed by banks in the form of monthly account fees, foreign ATM fees, NSF charges, etc.
Likewise, poorer customers are less able to avoid this kind of price discrimination at the grocery store.
If you walk or take the bus to the grocery store, you have fewer grocery stores to shop around for a deal at. If you're living paycheck to paycheck, you're less able to stock up on, say, cold medicine, when you see a good deal (and more likely to pay the "we know you're sick" price). And if you're time-poor (because you're working two jobs, and neither are the kind you can browse the Internet at while your code is compiling), you're less able to do comparison shopping, or notice that the price of what you need is always more expensive than when you don't.