Google "Austrian business cycle theory" for lots of material on the idea that boom & bust is caused by over/under-investment as a result of monetary policy dist

Google "Austrian business cycle theory" for lots of material on the idea that boom & bust is caused by over/under-investment as a result of monetary policy distorting the "price of money" by manipulating interest rates. I haven't looked too deeply into whether it's a useful or explanatory theory, but that is what they believe.