My comment turned into an answer, as it is slightly different from LogicianWithAHat's:

>! Everybody secretly throws X things into a bag, where X represents their accruate monthly payment and 'things' is something small like a matchstick or the like. Then you just count when all are done.

Why is it different/superior ?

>! - Does not require that anybody gets to know the payment of anybody else<br>
>! - Does not require any sequence