In forex there is a broker that offers fixed spread and variable spread, fixed spread means the spread remains the same although the price move in high volatility, the problem is often faced requote, because usually fixed spread is offered by the dealing desk broker, while the variable spread is dynamic, depending on market volatility, especially when news, it possible spread wider because market mechanism, broker that offers variable spread usually STP or ECN, but one advantage is all orders placed will instantly be executed without delays or requote.
