Drawing from his time at the US Treasury, Amias Gerety explains that recessions are about slowing growth. A financial crisis is a far more dangerous event where fundamental assumptions collapse because assets previously considered safe are suddenly perceived as worthless, causing a "sudden stop" in the economy.

Former RBI Governor Raghuram Rajan points to a historical pattern preceding every major financial crisis: a U-shape in monetary policy. An extended period of easy money builds up risk, and the subsequent tightening phase triggers the collapse. This framework helps identify periods of heightened systemic vulnerability.

Market stability is an evolutionary process where each crisis acts as a learning event. The 2008 crash taught policymakers how to respond with tools like credit facilities, enabling a much faster, more effective response to the COVID-19 shock. Crises are not just failures but necessary reps that improve systemic resilience.

According to Andrew Ross Sorkin, while bad actors and speculation are always present, the single element that transforms a market downturn into a systemic financial crisis is excessive leverage. Without it, the system can absorb shocks; with it, a domino effect is inevitable, making guardrails against leverage paramount.

America's system of nearly 10,000 banks is not a market inefficiency but a direct result of the founding fathers' aversion to centralized, oligopolistic British banks. They deliberately architected a fractured system to prevent the concentration of financial power and to better serve local business people, a principle that still shapes the economy today.

Contrary to popular belief, the 1929 crash wasn't an instantaneous event. It took a full year for public confidence to erode and for the new reality to set in. This illustrates that markets can absorb financial shocks, but they cannot withstand a sustained, spiraling loss of confidence.

Morgan Stanley's 1935 founding was a direct consequence of the Glass-Steagall Act, which forced a separation between commercial banking (deposits, loans) and investment banking (trading, underwriting). This regulatory mandate created the specialized firms that define the structure of modern finance today.

The Great Depression paradoxically created more millionaires than other periods. Extreme hardship forces a subset of people into a "hunger mode" where their backs are against the wall. This desperation fuels incredible innovation and company creation, provided the government clears regulatory hurdles for rebuilding.

In today's hyper-financialized economy, central banks no longer need to actually buy assets to stop a crisis. The mere announcement of their willingness to act, like the Fed's 2020 corporate bond facility, is enough to restore market confidence as traders front-run the intervention.