If you are an economist (a field is already more an ideology / spin machine than science -- the science part in it is basically math), and you are more into entertainment (e.g making the NYT best selling list of shallow books) than science, then you can "prove" a lot of things, without actually proving anything.

Start with a few unexamined wrong assumptions, select the data that fit your conclusion, dress them up with anecdotes and prose, and there you go!