PAW (Prodigious Accumulator of Wealth) and UAW (Under Accumulator of Wealth) are concepts from The Millionaire Next Door that explain why some people quietly build wealth while others struggle despite high incomes. A PAW lives below their means, saves consistently, and invests with discipline, focusing on net worth rather than appearances. A UAW often earns more but spends most of it on lifestyle upgrades, status symbols, and debt. The key difference isn’t income—it’s behavior, habits, and long-term thinking. Over time, PAWs gain financial freedom, while UAWs remain trapped in paycheck-to-paycheck cycles despite outward success.