Delta, Mu, Omicron, etc. Only eight months ago, I wrote about the regularity of market drops and what always follows. Over the last 40 years, the Standard & Poor’s 500 Index has had average annual interim drops of 14.3%. More than half of those pullbacks were greater than 10%, but a full recovery and even higher prices came after the dips every time. Given the stretched valuations that have prevailed for an extended period, the question was never whether there would be a pullback, but what would set it off. Stretched valuations alone don’t start selloffs and they often persist far longer than one would expect. In the past, however, the trigger for market hiccups has typically been unusual geopolitical events. Concern about the pace of economic progress is another trigger, as is what lies ahead for interest rates. Yet, much of the recent news about business has been encouraging and prospective increases in interest rates will probably be grad...