Share your insights or perspective on the financial matter presented in the input.

Is debt almost always the cause of crashes and recessions?
The statement can be true, but isn't a general rule. Crashes and recessions are two different things. A crash is when the market rapidly revalues something when prices are out of equilibrium, whether it be stocks, a commodity or even a service.  When the internet was new, nobody knew how to design webpages, so web page designers were in huge demand and commanded insane price premiums. I literally had college classmates billing real companies $200+/hr for marginal web skills. Eventually, the market "clued up" and that industry collapsed overnight. Another example of a crash from the supply point of view was the discovery of silver in the western US during the 19th century -- these discoveries increased the supply of the commodity to the point that silver coin eroded in value and devastated small family farms, who mostly dealt in silver currency. Recessions are often linked to crashes, but you don't need a crash to have a recession. Basically, during a recession, trade and industrial activity drop. The economy operates in cycles, and the euphoria and over-optimistic projections of a growing or booming economy lead to periods of reduced growth where the economy essentially reorganizes itself. Capital is a (if not the) key element of the economic cycle -- it's a catalyst that makes things happen. Debt is one form of capital -- it's not good, not bad. Generally cheap capital (ie. low interest rates) bring economic growth. Why? If I can borrow at 4%, I can then perform some sort of economic activity (bake bread, make computers, assemble cars, etc) that will earn myself 6, 8 or 10% on the dollar. When interest rates go up, economic activity slows, because the higher cost of credit increases the risk of losing money on an investment. The downside of cheap capital is that risk taking gets too easy and you can run into situations like the $2M ranch houses in California. The downside of expensive/tight capital is that it gets harder for businesses to operate and economic activity slows down. The effects of either extreme cascade and snowball.