Finance | Economics | Business on Instagram: "1️⃣ ARCH (Autoregressive Conditional Heteroskedasticity) ARCH models volatility as dependent on past squared returns. It captures volatility clustering (high volatility followed by high volatility). Example: Use ARCH to model sudden volatility spikes in a stock after earnings announcements. ⸻ 2️⃣ GARCH (Generalized ARCH) GARCH improves ARCH by including both past shocks and past volatility. It is one of the most widely used volatility models in finan