Abstract: A betting method determines rate of return on a bet by employing supply and demand forces. The bet can be made on any uncertain future event that has at least two outcomes (e.g. sporting events, financial market fluctuations, and elections). Investors that place a bet on a particular outcome provide money to a betting machine and receive shares (specific to the chosen outcome) in return. For each possible outcome there is a share type. Shares that correspond with the winning bet have a certain guaranteed value when the outcome is determined; losing share types are normally defined as worthless. Before the winning bet is determined, share values are calculated following a supply and demand model according to the following equation: Q 1 = B 1 B Tot where Q1 is the share value for shares corresponding to a first outcome, B1 is the amount bet upon the first outcome, and BTot is the total amount bet on all outcomes. Analogous equations determine share values for all other outcomes.