Addendum on the Walgreen’s quiz: The motivation for the quiz was the observation that people buy stuff in the “front end” of a drugstore relatively evenly on each day of the week, but in the pharmacy section of the store, business drops off precipitously on the weekend.
I don’t understand why this is true; perhaps one of the pharmacists who reads this board will chime in.
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”