Interesting Issue [1]

Which came first, the chicken or the eggs?

This relevant question was answered by Walter N. Thurman and Mark E. Fisher: Chikens, Eggs, and Causality, or Which Came First?, American Journal of Agricultural Economics, Vol. 70, No. 2. (May, 1998), pp. 237-238.

The answer? Read the paper and learn about causality tests.

In addition to this amazing contribution, the authors pointed out other fruitful research topics: "He who laughs last laughs best" and the multivariate "Pride goeth before destruction, and an haughty spirit before a fall"