Capital markets firms make money when investors are active — trading volumes, new listings, M&A transactions and structured products all drive revenue. That creates a business model that benefits from volatility and market activity but suffers during periods of low volume or reduced risk appetite. Exchanges and market infrastructure companies are the most attractive within the group: they own network-effect monopolies on financial infrastructure, earn recurring data subscription fees and benefit from both rising volumes and market volatility. Brokerages are more cyclical, with revenues directly tied to client activity. Payment for order flow, zero-commission trading and regulatory changes have compressed margins for retail-facing brokers. For investors, market infrastructure operators are among the most durable financial businesses, while trading-dependent firms require cycle-aware positioning and close attention to volume trends as a leading revenue indicator.