Hmm, Stiglitz's actions there seem more illustrative of hoity-toityness than absent-mindedness. If he'd merely been absent-minded, he would have taken the subway and wound up at Far Rockaway or somesuch. His reflexive preference for a cab seems similar to that of many Manhattanites who would never mix it up with the mob down in that grotty subway, even if the subway gets you where you want to go a lot faster.
Carl
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