Mark Bils
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Mark Bils is a macroeconomist at the University of Rochester. Like most macroeconomists, Bils is interested in the business cycle and has written extensively on it.
In 1987, Bils published The Cyclical Behavior of Marginal Cost and Price in the American Economic Review where he argued that marginal cost is procyclical. This is driven from the counterintuitive fact that employment is high when wages are high. Thus, Bils argues, an increase untrained labor must increase marginal costs (in the same way an increase in demand increases wages).
"You don't put attractive people in the back, that's why they're called check out counters"
Mark Bils