Print money. Or steal it from every Monopoly set you can find. A good idea is asking to go to the bathroom and then just raiding the game closet.
Start your own bank. A shoe box will do just fine.
Issue small business loans to your friends. They can give the money to mom or dad to buy items for their "lemonade" stand, and then you can come right back around and collect it all back for charity (like more small business loans). Then, they can pay you back with money from the "outside world." Use it to buy more money! (You'll be buying a country in no time!)
CLICK HERE to
use the money-maker template!