FWIW i first learned of it from a libertarian angle, which equated business cycle with economy wide (mal) investment which was, in practice, usually driven by the fed or some comparable government program. Whether consistent or not it holds at least some truth and was an interesting angle to start learning about economics.
Libertarianism and Austrian economics has a perception of outright rejecting empiricism and other rational thought, so I'd like to add a clarification. Libertarian theory doesn't deny naturally occurring downturns in economies, but that the severity and length of them are lessened without state mismanagement. Potentially, to the point that nation-spanning busts would be a thing of the past.
