Hosted by Patrick McKenzie (patio11), "Complex Systems" dissects the hidden infrastructure—financial, technological, legal, and regulatory—that keeps modern civilization running. Each episode typically features McKenzie reading and expanding on his "Bits about Money" essays, unpacking topics like electricity markets, payment finality, charitable giving infrastructure, and the economics of AI data centers. With a deeply analytical yet accessible style, McKenzie draws on his fintech and payments expertise to reveal how incentives, institutions, and quietly engineered systems shape everyday life. Episodes blend historical case studies (the Citibank-Revlon wire mishap, ERCOT's 2023 heat wave payouts) with forward-looking commentary on AI's impact on energy and philanthropy. The show appeals to finance professionals, engineers, policy wonks, and curious generalists who want rigorous, first-principles explanations of "boring but critical" systems. Its tone is conversational yet intellectually dense, favoring clarity over sensationalism, and often includes detailed timestamps and linked source essays for further reading, making it a favorite among builders and operators of complex institutions.