Government procurement, or public procurement, is the procurement of goods, services or constructions on behalf of a public authority, such as a government agency. With 10 to 20% of GDP, government procurement accounts for a substantial part of the global economy. To prevent fraud, waste, corruption, or local protectionism, the law of most countries regulates government procurement more or less closely. It usually requires the procuring authority to issue public tenders if the value of the procurement exceeds a certain threshold.