Nashes cooperation theory in practice

Hello hello,

Here is the situation:

  • 1,000,000 traders.
  • A “closed” stock market, with a 24 commodities available.
  • Finite resources, everyone starts with 3mill and new capital is injected only very rarely.
  • The market is open 24 hours a day.

This is part of the premise of a game I am presently playing, and while I have always known we take it too seriously, I found the ultimate proof yesterday. A bunch of the Spaniards are trying to get together enough of the traders to work together according to Nashes theory, thus “benefitting all”.
I have no idea whether this is feasable or not, and at any rate it is slightly pointless in during a competitive game, everyone can’t win.

Here is my question. How many traders do they actually need to get together to create an impact on the market that they could benefit from? I am assuming there must be some critical mass involved. I leave my question in your hands.

Iteki