2008 Financial Crisis: Marked by a severe spike in the high yield spread, significant S&P 500 decline, and aggressive Fed rate cuts to stabilize the economy. COVID-19 Market Crash (2020): Triggered sharp increases in market volatility and credit spreads. The Fed's rapid rate cuts aimed to support the economy. Bitcoin also experienced notable price movements. Interest Rate Cuts: Implemented during periods of economic slowdown or financial stress, leading to narrowing credit spreads and market stabilization. SPX All-Time Highs: Peaks in the S&P 500 indicating market optimism, often followed by corrections during economic weakening. Credit Spreads Narrowing: Indicates improving economic conditions and reduced credit risk, often coinciding with market recoveries. Significant BTC Price Movements: Reflect broader market reactions and investor behavior during major financial events.