Question

You go to the bank to trade a dirty dollar for a new, clean one. The cashier tells you the trade is not necessary because currency is?

Answer 1

Wait, what?
The dollar is considered a currency so it must be worth the trade, and by the way, every dollar is dirty and contaminated no matter how many people use it. There is no such thing as a new "clean" dollar.
I bet this question is about pure logic. So there's the answer.
Hope that helps. :)

Answer 2

Seems like Economics Question in Biology section :p

Answer 3

Is the point of the question that even if your money is old and dirty it's just as useful as a new dollar bill? This is a weird question!!!

Answer 4

As long as the bill is intact and in one piece, no matter what you use it to buy something with they won't care of the condition.