CB,
“why...not trade outrights?”
The price of a share or option can range from zero to (theoretically) infinity. Trading direction and being on the wrong side – holding shares or short puts in a sell-off; short shares or short calls in a rally assumes (in my opinion) too much risk, ie open-ended.
By contrast, trading implied volatility, eg delta-neutral vertical spreads, straddles or strangles, is a more conservative proposition. Theoretically, there is no upper limit to the iv level, but in practise it’s constrained.
Why is this? I think it’s simply supply and demand. The excess of intrinsic value (time value or iv) reflects perceived risk. If iv is low there will be buyers but the sellers will eventually raise prices to maximise returns. Buyers will be willing to pay higher premiums but only to a point. If iv is high there will be fewer buyers, and sellers will emerge. As there will be fewer buyers at the higher levels, the sellers will need to accept lower and lower prices.
There is constant readjustment to find the optimum level – the maximum buyers will pay, the minimum sellers will accept. So while high iv may reflect perceived risk, I think it also reflects testing of the market. Therefore, while the underlying of an option is unlimited on the upside, the excess of intrinsic value is limited. Of course, where perceived risk is realistic – economic deterioration, terrorist threats, etc – then premiums may then reflect a degree of reality.
See attached chart. This is the longest run I have of FTSE daily iv (334 days) from 19999 – 2000. Apologies for the quality.
Split,
“Most brokers...expound the virtues of option trading.”
Perhaps more importantly, there is a good economic case for the broker, ie not the client.
Assume a client is 25 years old and has £10,000 to invest. He could buy 10,000 shares at £1.00 and he’ll be charged a commission, say £25. He could hold these shares forever and on death (say 85 years) pass them on to his heirs. So, £25 commission to the broker over this time-period is not conducive to a decadent life-style.
As an alternative, the broker persuades the client of the virtue of options. The client buys 10 option contracts and is charged commissions of £25 per contract. Total commissions = £250. Nine months later at expiry, and through very safe strategies, the client makes a small profit. Repeat until death at 85 years =
80 (nine-month periods in 60 years) x £250 = £20,000 comm’s.
If the client traded three-month contracts, the comm’s will be £60,000. Vertical spreads = £120,000, butterflies = £240,000, etc.
Ok, an extreme example but the economic case is sound.
I’ve got a note on my screen, “No short puts – 1 bad event and wipe out” .
Grant.