Given the sheer size of the forex market and the amount of participants, no single institutional trader (no matter how big) can control market prices for an extended time period. The market quickly calibrates itself and levels the playing field. Additionally, the forex market is decentralized and there are no middlemen. You trade directly with another participant in the market and a retail forex broker simply facilitates this connection. Essentially the market is influenced directly by the economy itself, not one person or a company. You can’t corner it and you can’t control it, and that means that you’re not as small a fish as you may think.