2 - 5 Players
In-game money is bet on different commodities in hope that that particular commodity will become the most valuable as the game progresses. Often the values of the commodities are continually changing throughout the game, and the players buy and sell the commodities to make money off of their investment.
Hand management games are games with cards in them that reward players for playing the cards in certain sequences or groups. The optimal sequence/grouping may vary, depending on board position, cards held and cards played by opponents. Managing your hand means gaining the most value out of available cards under given circumstances. Cards often have multiple uses in the game, further obfuscating an "optimal" sequence.
The primary goal of a set collection mechanic is to encourage a player to collect a set of items.