The economy of Canadais a highly developed mixed economy with 10th largest GDP by nominal and 16th largest GDP by PPP in the world. As with other developed nations, the country's economy is dominated by the service industry, which employs about three quarters of Canadians.Canada has the fourth highest total estimated value of natural resources, valued at US$33.2 trillion in 2016.It has the world's third largest proven petroleum reserves and is the fourth largest exporter of petroleum. It is also the fourth largest exporter of natural gas. Canada is considered an "energy superpower" due to its abundant natural resources and small population.Canada is unusual among developed countries in the importance of the primary sector, with the logging and oil industries being two of Canada's most important. Canada also has a sizable manufacturing sector, based in Central Canada, with the automobile industry and aircraft industry being especially important. With the world's longest coastline, Canada has the 8th largest commercial fishing and seafood industry in the world.Canada is one of the global leaders of the entertainment software industry.It is a member of the APEC, NAFTA, G7, G20, OECD and WTO.Service sectorThe service sector in Canada is vast and multifaceted, employing about three quarters of Canadians and accounting for 70% of GDP.The largest employer is the retailsector, employing almost 12% of Canadians.The retail industry is concentrated mainly in a small number of chain stores clustered together in shopping malls. In recent years, there has been an increase in the number of big-box stores, such as Wal-Mart(of the United States), Real Canadian Superstore, and Best Buy(of the United States). This has led to fewer workers in this sector and a migration of retail jobs to the suburbs.The Financial Districtin Downtown Vancouver. Canadian business services are largely concentrated in large urban areas of Canada.The second largest portion of the service sector is the business service and hire only a slightly smaller percentage of the population.This includes the financial services, real estate, and communications industries. This portion of the economy has been rapidly growing in recent years. It is largely concentratedin the major urban centres, especially Toronto, Montrealand Vancouver(see Banking in Canada).The education and health sectors are two of Canada's largest, but both are largely under the influence of the government. The health care industry has been quickly growing, and is the third largest in Canada. Itsrapid growth has led to problems for governments who must find money to fund it.Canada has an important high techindustry, and a burgeoning film, television, and entertainment industrycreating content for local and international consumption (see Media in Canada).Tourismis of ever increasing importance, with the vast majority of international visitors coming from the United States.