Arbitrage is a financial transaction designed to ensure that a positive gain or no way certain in taking advantage of temporary differences in prices between different securities or contracts. Traders are professionals who are constantly on the lookout for opportunities presented by these price differencesTheir role helps to smooth clear distortion of the market (self-regulation of financial markets): each time an arbitration is possible, these operators benefit until it is more interesting, thus bringing down prices to their fair value. The more a market is 'perfect', liquid and transparent, fewer of these arbitrage opportunities appear and or remain available for a long time.
