Question: Scrap measures how much scrap is left after a shift. A lower scrap number means less waste. Compute the difference in average scrap in treated

Scrap measures how much scrap is left after a shift. A lower scrap number means less waste. Compute the difference in average scrap in treated and not treated firms in 1987 and compute the same difference in average scrap in 1988. How does that difference in waste, between Treated and Not Treated firms, change from 1987 to 1988

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