As a non economist and one without formal finance training, I have the same question on volatility vs risk of an asset. To me, initiatively, modern portfolio theory make a lot of sense but I question if volatility can represent risk as you mentioned?
I often thought about what you said: When an asset/asset class is more volatile, it is usually defined as more "risky" because in a down market, it drops more than a non volatile asset. But for someone with a long view perhaps it is really not as risky (e.g., small cap index) as volatility indicated. Might it then make sense to purchase it during those down markets?
May I ask: how then does MPT define risk? I saw a lot of write ups using the Beta of the stock to calculate risk vs return. Isn't Beta a measure of volatility?
In any case, Scrooge, thanks for providing me some foods for thoughts. On a side note, I agree with the others that ATM may appear expensive but from a probability and statistically sense it is not necessarily so. Intuitively, as I go higher and higher in strike (more OTM), I will reach a point where the strike is so high that the probability of the stock reaching that strike is zero and the option will expire worthless every time. There must be an optimum strike price for risk vs return for each situation but I am not smart enough to know what that is.
Regards,