It is easy to get money from foolish people. / It is difficult or unlikely that foolish people maintain their hold on acquired wealth.

Noticeably fake bills or coins intended for use as toy currency, especially with board games, rather than currency in a legitimate exchange market.

(inorganic chemistry) nitrous oxide

Nitric oxide.

(economics) The total amount of money (bills, coins, loans, credit, and other liquid instruments) in a particular economy.

The acquisition of money.

Profitable. / For profit.

(slang, economics) Money, or other financial instruments, that moves regularly between different markets in search of the best interest rate. / (slang) Stolen currency.

(Teesside, Northumbria, offensive) A person from Hartlepool.

(idiomatic) A ridiculously large (or, less commonly, small) sum of money.