The answers are very simple: since scalping provides smaller profit in each smaller trading lot, traders will require a lower spread and the fastest trade executions all the time. Thereby as a scalper, I am working with AAFX. This licensed broker provides me with the lowest zero spread and re-quote and slippage-free, timely trade executions so that I can always take advantage of short-time price movements and earn good profit by engaging in trades at the right time.