I disagree. Mms can move the price up or down anytime they want without market participants. Hence, market makers. In my example, the new bid/offer when the U.S opened would be say 3.00/3.01 so your 40 cent order would get filled at 3.00. Limits are current price of better.
Tiger is 100% right here. Research arbitrage across stock exchanges, especially international. Global funds would be able to manipulate the price difference. They would have a risk-free advantage.
You will see adjustments premarket every morning in the US. And vice versa to the Six.