I don't see what you are calling a flaw here. Yes, in some places there is trading over the weekend. It is very, very limited, though, and prices generally don't move in any noticeable or meaningful fashion, aside from the spreads getting widened out substantially. Yes, thanks to that action you could get a read on where Tokyo will open trading.
Here's my question to you, though: How can you profit from that?
The only way this would be anything like knowing the result of the race before the bookie does (to use your example, which is a bit off because the bookie won't take bets once the race has started, if I'm not mistaken), is if you could somehow put on a trade at a price other than the initial bid/offer seen on the Tokyo open. How do you propose to execute a trade before the open, so to speak?
By the way, knowing where the market is going to open is not confined to forex. It's been that way in stocks for years.
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