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Suppose One could test the hypotheses above the technology, worker experience and etc had no effect on worker productivity by finding a source of random, exogenous variation. In particular, one were might find be able to find test this the effect of experience. The authors report that in some countries -- both temporary as well permanent staff were employed during different periods of the sample period. This might create an opportunity for a natural experiment differences-in which settlers from different local cultures randomly inhabited-differences approach to see how productive less experienced employees are.
→How might these tests be run if one had quantitative evidence?
===How might these tests be run if one had quantitative evidence? ===
===What problems might arise in this quantitative analysis?===
The biggest problem is that local culture -- the author's primary driving force behind differences in outcomes -- is hard to distribute randomly.
