Zeni

Zeni is money value used in Dragon Ball. It can be earned for life here on Earth.

How to get some money:
You can do many things to get some money like:
 * Win atleast 3rd place on Martial Arts Tournament;
 * You can work as, maybe, policeman, or maybe shopkeeper and whatnot;
 * The bad way: fake your money;
 * Other bad way: Steal it;
 * You also can be good civillian by maybe saving someone's life and many more...