The act of buying and selling goods simultaneously in different markets to gain an immediate profit. Impressive, but tricky.Arbitrage is the simultaneous purchase and sale of the same asset in different markets in order to profit from a difference in its price. The simultaneous purchase and sale of the same securities, commodities, or foreign exchange in different markets to profit from unequal prices. Arbitrage is the simultaneous buying and selling of a good for two different prices, locking in a guaranteed profit. Arbitrage is when an asset (stocks, currencies, etc.) is bought in one market and sold in another for a higher price. 0007622001P00004 Appropriate Violator Classifications and Timely Initial Enforcement Actions Would Strengthen Montana s RCRA Enforcement Program. Arbitrage is the simultaneous buying and selling of an asset in order to profit from a difference in the price of the asset on two different markets.