Good article. May I quote?
"However, there are indications that the numbers may be a reflection of a strong labor market that has created attractive career opportunities for college graduates in many fields who otherwise might have considered entering medicine or the health professions. A review of the history and data on numbers of applicants over the past 40 years shows that they tend to follow a cyclical pattern, the characteristics of which have been strongly influenced at times by government policies and socioeconomic trends."
It goes on to mention times of war, the stock market, Internet boom, etc, as potential factors, which all seem economic (or related) to me, which was my point.
But you're correct, they also note correlation to changes in MCAT, but my impression from the article was that the AAMC made MCAT changes in order to combat these pre-existing changes.