In international economics, tourism receipts are classified as "invisible exports" (services exports)—and for good reason. The mechanism mirrors goods exports, but the "product" crosses borders differently.
No shipping container, customs declaration, or physical transfer of the service occurs across the frontier. The transaction is recorded in the Balance of Payments (Current Account, Services), not the Trade in Goods ledger. Yet the macroeconomic effect is identical: foreign currency enters the domestic economy.
Governments treat tourism promotion like export promotion: trade missions, "Brand [Country]" campaigns, visa facilitation, and investment incentives for hotel infrastructure. The World Trade Organization (WTO) General Agreement on Trade in Services (GATS) even includes tourism under Mode 2 (Consumption Abroad).
So when a visitor buys a handwoven rug in Marrakech or a sushi breakfast in Tokyo, they are, in effect, importing the experience—and their home country is exporting currency. That invisible flow powers very visible development.