Money!

Macau and Hong Kong each have their own currency.  In Macau you can pay for things with their money or with Hong Kong Dollars.  Change is given in both currencies.  It reminded me of Cambodia where you can pay in Riel and in USD.

All of the money kind of looks like play money. 

My favorite is the 10HKD note.

10 is the smallest note they make.  Carrying around so many coins is heavy!