For, as a participant, you are the market.
The effect you have on the market may seem insignificant, but it is there.
And as exciting and strange as it may seem, even if you do not trade, your will may be able to move the market. According to the Princeton Engineering Anomalies Research program, out of several million trials, they've detected small but "statistically significant" signs that minds may be able to influence the physical world by intention alone.
I've linked to articles about this before, and here is another. It is difficult not to be skeptical, but it is also extremely fascinating.