PitBulls

From BoardGameGeek:

Stock exchange simulation game, where the TRADERS watch a 10-round, 8-way contest (among 8 COLORS) and BET/TRADE on the winner of that contest. The themes are negotiation, probability estimation, and trend-spotting. The goal is to finish with more money than you start with, and even better - finishing with the most money. The mechanism of negotiation is "open outcry" - there are no "turns"; it's everyone's turn at all times to make any deal they can with anyone who is willing to listen to their price(s). All TRADERS start with a portfolio of 4 shares of each COLOR, plus $400 in cash. As the contest proceeds through 10 rounds, a TRADER use his/her cash to buy COLORS from other TRADERS, and the TRADER will sell shares of his COLORs to raise cash. The game ends when the 10-round contest is over. At that time the shares of the winning COLOR are worth $100, and the shares of all other COLORs are worth zero. Each TRADER finishes with a total value of his/her portfolio: CASH + SHARES FINISHING "in the money". PitBulls can be customized to trade on ANY multi-way (up to 8 player/outcome) event or contest. Plus, it's expandable (with more colored (or textured) cards) to trade on ANY event (like the NCAA tournament, presidential election, best performing IPO for the month). If played on a concurrent game of Monopoly, for example, PitBulls becomes a meta game; a session of PitBulls lasts as long as the contest/event on whose outcome you are trading. -description from designer