Understanding Forex Spreads

Spreads should always be considered in conjunction with depth of book. Oddly enough, when it comes to economies of scale, forex doesn't even act like most other markets. On the inter-bank market, for example; the larger the ticket size, the larger the spread is. So when you see a 1-pip spread on an ECN platform, you have to wonder if that spread valid for a $2M, $5M or $10M trade, which it probably isn’t. In many cases, the tight spread that is offered applies only to a capped trade sizes that are very inadequate for most of the common trading strategies.