The document discusses the economic impacts of tourism on both host countries and tourist destinations. It outlines several positive economic impacts such as foreign exchange earnings, government revenues, employment generation, and contributions to local economies. However, it also notes some negative impacts like leakage of tourism revenue out of the local economy, enclave tourism developments, high infrastructure costs, price increases in local areas, and economic dependence on the seasonal tourism industry. International tourism is one of the world's largest economic sectors, generating over US$852 billion in 2009.