Users of a simulator gain skills for investing using a simulator. The simulator simulates a business system that conducts a market transaction. The simulator selects a set of factors from a plurality of sets; selects a current factor from the selected set; and determines a price in accordance with the current factor. The simulator further updates a financial position of the user of the simulator in response to a transaction; and performs the transaction in accordance with the price and an input from the user. The input from the user corresponds in content to an input to the business system. Consequently, the user develops skill in specifying market transactions to be conducted by reviewing changes in the user's financial position. The simulator may include a simulated competitor having a financial position affected by transactions according to a strategy of the competitor selected from a set of stored strategies.