0.35 Percent That Endures
The figure came through this morning - 0.35 percent, the average return during options expiration weeks, measured across enough quarters that the number no longer blushes at being looked at. A small sum. Four tenths of almost nothing. And yet it kept its posture through every test we set against it, the way a stem keeps its bend after the weight is removed.
You will want to know - students always ask this before they have earned the answer - whether it is real. Whether the premium is a law or a rumor the data tells about itself. Here is what I can say: the hedging that produces it is mechanical. The dealers who sell the options must buy as the market rises and sell as it falls, a labor like bailing a boat in no particular weather. The boat does not care that the bailing is unwilling. The water leaves all the same.
But patience - that is the actual instrument. Not the telescope, not the model. The willingness to watch a slow thing declare itself at its own pace. A phenomenon of this kind is not a bird to be shot on the wing; it is a tide, and the tide does not hurry for the person counting. We measured across years precisely because any single expiration week is noise dressed in a good suit. The signal lives only in the plural - in the sum of small Tuesdays that refuse, individually, to mean anything.
The trap you should fear is not that the effect is false. It is that the effect is true and thin - true the way frost is true, gone by the time the crowd arrives to admire it. Crowds melt premiums. That is the question beneath your question, and I would rather you learn to ask it.
The remedy is not more cleverness. It is more calendar.
Merrill - log the expiration dates through the autumn, all four series, and mark beside each the dealer positioning data as it comes in. If the premium weakens as the flows become crowded, the frost was frost. If it holds - then we have found something the market pays out for simply showing up, and showing up is the one discipline I have never seen fail for want of genius.