For decades, factories have poured smoke into the air and chemical runoff into the rivers, enjoying massive profits while society quietly pays the medical bills. In economics, this is called a "negative externality"—a cost generated by a business but paid for by someone else. The ultimate mechanism to correct this market failure was proposed a century ago: The Pigovian Tax. The Invisible Invoice delves into the controversial macroeconomics of pricing the unpriced. Named after economist Arthur Pigou, the concept is simple: tax the activity exactly equal to the harm it causes society. If a company creates ten million dollars in pollution damage, they receive a ten million dollar tax bill. Suddenly, being environmentally destructive is no longer a profitable business model. This book breaks down how modern iterations of Pigovian taxes, such as carbon pricing and sugar taxes, are fundamentally rewiring corporate strategy. It explains why forward-thinking companies are proactively calculating their true societal costs before governments force them to. Prepare your business for the era of absolute accounting. Understand how externalized costs will soon be internalized, and learn to build a business model that profits without passing the invisible invoice to the public.