Can you spend money rationally?

Full name of test: Can you spend money rationally?
Description: What does it mean to spend money rationally? It's much more than just to buy a tuft of lettuce at a low price. Enterprising people prefer to make money. And what about you? Can you orient in free market? Can you run risks reasonably? Are you a spender, or, maybe, you are afraid to place your bet? Test yourself.
Kind of test: For general use

Login:
Password:

(if you want to take test anonymously,
don't enter your password and login
)