Three federal programs enable students to repay money borrowed for education based on a sliding income scale. (gocleancredit.com)
At the time, there happened to be a veterinary clinic that operated on a sliding income scale, so you paid what you could afford, dependent on income. (thriftyfun.com)
If there's roughly one house for every five people, then you'd better make sure that the price you set to sell your house is affordable to people in the upper fifth of income scales, or else you are mathematically guaranteed not to have any customers. (money.stackexchange.com)