Also he lets you pay it back at your own pace, in as many or as few installments as you please, as often or as rare as you please, with no interest or collection letters or harassment. The only thing he won’t do is give you expansions until the previous amount is paid back, which you theoretically could never do. You only pay him because you wanted to, never because he made you. 

Stop the Tom Nook slander. That raccoon is a straight up an angel.