Arbitrage is basically buying a security in one market and simultaneously selling it in another market at a higher price, profiting from the temporary difference in prices. This is considered a risk-free profit for the investor/trader.
Arbitrage exists as a result of market inefficiencies; it provides a mechanism to ensure prices do not deviate substantially from fair value for long periods of time.
Equity shares that allow the arbitrage process include:
Telecom Egypt (ETEL)
Orascom Construction (OC)
Orascom Telecom (OT)
IDITA
Commercial International Bank (CIB)
EFG Hermes