frugi
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The difference is high because we have just rolled over to Jun 06 futures. Today's fair value on the Dow is around 81 points above the cash value.
Fair value is calculated by adding the cash value of the index in question to the interest I would have to pay my broker to borrow enough money to buy all of the stocks in it, minus all of the dividend cheques I would have received from those stocks.
http://www.indexarb.com/fairValueDecomposition.html
As time passes FV will fall to zero at or near expiry.
During the trading day the premium (futures - cash) will fluctuate around fair value. When it fluctuates more than a few points away from FV arb programs kick in and either sell futs / buy stocks or buy futs /sell stocks to kick the cash - futs relationship back into line. This activity only forms a small proportion of 'program' trading.
The indicator at the bottom of this chart shows this fluctuation in a range of 10 odd points, albeit crudely and I suspect rather inaccurately. There are no PREM figures available from IB so I had to build my own. :-(
Fair value is calculated by adding the cash value of the index in question to the interest I would have to pay my broker to borrow enough money to buy all of the stocks in it, minus all of the dividend cheques I would have received from those stocks.
http://www.indexarb.com/fairValueDecomposition.html
As time passes FV will fall to zero at or near expiry.
During the trading day the premium (futures - cash) will fluctuate around fair value. When it fluctuates more than a few points away from FV arb programs kick in and either sell futs / buy stocks or buy futs /sell stocks to kick the cash - futs relationship back into line. This activity only forms a small proportion of 'program' trading.
The indicator at the bottom of this chart shows this fluctuation in a range of 10 odd points, albeit crudely and I suspect rather inaccurately. There are no PREM figures available from IB so I had to build my own. :-(