What is a arbitrage?

Answer:
An arbitrage opportunity exists when an investor has a trading strategy, which requires no money from him, but can produce profits. See here for an example:

http://www.riskyreturn.com/arbitrage.html
First answer by Ufukguc. Last edit by Ufukguc. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 1 [recommend question].