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Consider y = β0 + β1x1 + β2x2 + u and E[u | x1, x2] =...

Consider y = β0 + β1x1 + β2x2 + u and E[u | x1, x2] = 0.

If we omit x2 and regress y on x1, the bias for the estimator of β1 can be written as the product of two objects. What are the two objects?

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