From the Document: "During the past 50 years, the United States has played a prominent role in developing international trade rules on government procurement. Most U.S. free trade agreements include government procurement obligations. The most notable international procurement agreement to which the United States is a party is the World Trade Organization (WTO)'s Agreement on Government Procurement (GPA). The GPA has opened procurement opportunities around the world to foreign competition, worth trillions of U.S. dollars annually. It also requires parties to establish transparent and nondiscriminatory rules for covered procurement. In particular, the agreement enables U.S. businesses to bid for certain government contracts in the markets of other GPA parties. Likewise, it allows foreign businesses to bid for contracts tendered by U.S. procuring entities in areas where federal and state governments have agreed to open up their procurement markets. The WTO estimates the size of the procurement market covered by the GPA at $1.7 trillion; data limitations make it difficult to quantify accurately the extent to which governments acquire goods and services from suppliers of other GPA parties."
CRS In Focus, IF11651
Congressional Research Service: https://crsreports.congress.gov/