The act of buying and selling goods simultaneously in different markets to gain an immediate profit. Impressive, but tricky.An arbitrage is a transaction that involves no negative cash flow at any probabilistic or temporal state and a positive cash flow in at least one state. The profit from buying something in one market and selling it in another. 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 purchase and sale of an asset in order to take advantage of a difference in price. Arbitrage is the simultaneous purchase and sale of the same asset in different markets in order to profit from a difference in its price. Definition. Arbitrage is the simultaneous buying and selling of assets in different markets to exploit price differences and make a profit. Arbitrage is the simultaneous purchase and sale of an asset to profit from an imbalance in the price. The simultaneous purchase and sale of equivalent assets or of the same asset in multiple markets in order to exploit a temporary discrepancy in prices.