According to the Corruption Perceptions Index, Canada is perceived as one of the least corrupt countries in the world, and is one of the world's top ten trading nations, with a highly globalized economy. Canada historically ranks above the U.S. and most western European nations on The Heritage Foundation's index of economic freedom, and experiencing a relatively low level of income disparity. The country's average household disposable income per capita is "well above" the OECD average. The Toronto Stock Exchange is the eighth-largest stock exchange in the world by market capitalization, listing over 1,500 companies with a combined market capitalization of over US$3 trillion.