TradeCalc

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In economics, Arbitrage is the practice of taking advantage of a state of imbalance between two (or possibly more) markets: a combination of matching deals are struck that exploit the imbalance, the profit being the difference between the market prices. A person who engages in arbitrage is called an arbitrageur.

      Arbitrage has the effect of causing prices in different markets to converge. As a result of arbitrage, the currency exchange rates, the price of commodities, and the price of securities in different markets all tend to converge to a fixed price. The speed at which the prices converge is one measure of the efficiency of a market. Arbitrage tends to reduce price discrimination by encouraging people to buy an item where the price is low and resell where the price is high. Sellers of goods and services often attempt to prohibit or discourage arbitrage.

     The simultaneous purchase and selling of a security in order to profit from a differential in the price. This usually takes place on different exchanges or marketplaces.
Arbritrage is legally allowed. In fact arbitrage is responsible for a large part of the daily volumes on the NSE & BSE exchanges.

      Market Arbitrage involves purchasing and selling the same security at the same time in different markets (BSE & NSE) to take advantage of a price difference between the two separate markets. A market arbitrageur would short sell the higher priced stock and buy the lower priced one. The profit is the spread between the two assets.