The psychological trick of seeing a one instead of a two at the front of a price, as in $19.99 versus $20 can work to increase sales.

商家一般认为一些小策略，比如价钱以1开头，比以2开头--就像19.99美元和20美元那样--能增加商品的销售量。

youdao

One unintended consequence some of our clients are seeing as a result of their conversion will be a one or two year spike in their Medicare B payments, since such premiums are based on two-year trailing modified adjusted gross income.

FORBES: Before you get out the checkbook, second thoughts on your Roth IRA conversion...