Changing prices on a per-customer basis is promoting inequality.
Businesses should be forced to offer uniform prices. Any deviation from purchases made with a credit card should be rebated back to the card. Any cash purchases are put into sales taxes. Any monthly payment is put as a per-day cost, and the rebate is anything over the lowest cost on any day of the year.
Until this happens, the growth of inequality, and increasing unfair business practices will happen, as they do as they are designed make profit. Businesses should find themselves providing services equally to everyone. In this day and age, anytime the price can change, constantly pulling from what your own purchase power is. This is also causing havoc on rate increases and sign on deals causing unpredictable behavior of pricing.