Just because macroeconomic textbooks and journal articles focus overwhelmingly on changes in aggregate demand as the chief cause of changes in the vigor of economic activity is no reason for a scholar not to search for some other cause, especially if another identifiable cause is solidly grounded in economic theory.
Becoming More Certain about the Role of Regime Uncertainty - Donald J. Boudreaux, economics departments, George Mason University
http://www.cato-unbound.org/2011/12/20/donald-j-boudreaux/becoming-more-certain-about-the-role-of-regime-uncertainty/
