In econometrics, we typically do not rely on exact or finite sample distributions because A)we have approximately an infinite number of observations (think of re-sampling). B)variables typically are normally distributed. C)the covariances of Y_i, Y_j are typically not zero. D)asymptotic distributions can be counted on to provide good approximations to the exact sampling distribution (given the number of observations available in most cases).

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Asymptotic distributions provide good approximations to the exact sampling distribution given the number of observations available, which is typically large in econometric analyses. This is because the Central Limit Theorem applies, which states that as the sample size increases, the sample mean approaches a normal distribution. Exact or finite sample distributions are seldom used because their computations can be complex and difficult, especially for large datasets.

In Econometrics, We Typically Do Not Rely on Exact or Finite