Fundamentally, this view of the business cycle is highly focused on methodological individualism – the business cycle occurs in the context of individuals maximising their happiness given constraints.
Before this strain of thought came out, business cycle theory was a surprising holistic section of economics – something that did not match with the individualistic nature of microeconomics (see Schumpeter). Furthermore, business cycle theory, long-term growth theory, and near term macroeconomics (effectively old school Keynesianism) were relatively incompatible.
Following the collapse of the “consensus” in macroeconomics during the oil crisis the one ray of hope was that we macroeconomics could be recreated in a way that is consistent with microeconomics. According to Kids prefer cheese this research area is still active – which is exactly what we want to hear.
Update: Paul Walker discusses the same article.