I've been messing about on betfair.com, although I've recently stopped because I know that the inevitable forces of randomness will bring me down to banker's ruin, so I had to withdraw while I was ahead. The ability to bet as well as lay was very useful, and I like the way they had good reserves of data. I managed to make a few trades which covered themselves regardless of the outcome, but later i learnt that this was not exactly arbitrage, but subject to market timing risk. Basically, on Asian Handicap, a bet on the outcome is like a binary option which goes into the money, while a lay is a put option. So if you were to bet for odds of £2.14, and 12 hours later the odds have fallen to £2.00, then you could lay at that price and lock in your profit before the event. Of course, there's always the risk that the odds will rise further from £2.14, leaving you with an unhedged bet (which is still worth it's expected value). So, you still need to identify fair value. Arbitrage is also difficult to find across markets (e.g. a bet on the no goals market and correct score 0-0 is almost always identical, as is arbitrage between -0.5 AH and straight win markets.) To find arbitrage which clears the 5% commission is even harder.
Interestingly, there has been a jump in expectatations that the Fed will raise interest rates next month.
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This is the Fed Funds implied probability chart lipjin sent me 2 weeks ago? Notice how there wasn't even a probability for an increase priced in. Ridiculous. You would have got a very good price.
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