This type of credit occurs when you charge a purchase at the time you buy the good or service

A sales credit is charged at the time of purchase.

and whats your questoin

due to the changes the federal reserve is making the unused reserves will impact the economy by them facing inflation. inflation is definfed as the increase in pricing of a good or service but the decline of the value of money used for purchasing those items. when the economy has a high inflation rate, they are subject to money loss and hurt on the economy.