Stock are categorized in various way one is by the country where the company is domiciled. For example, Nestle and Novartis are domiciled in Switzerland so they may be considered as part of the Swiss stock. As of mid 2017 the size of the world stock market was about US$76.3 trillion By country. the largest market was the united states followed by Japan and the United Kingdom these number increased in 2013.
As of 2015 there are a total of 60 stock exchange in the world with a total market capitalization of $69 trillion. Of these, there are 16 exchange with a market capitalization of $1 trillion or more, and they account for 87% of global market capitalization . Apart from the Australian security Exchange these 16 exchange are based in one of three continents America, Europe and Asia.
The purpose of a stock market exchange is to facilities the exchange of security between buyers and sellers, thus providing a marketplace. The exchange provide real time trading information on the listed security, facility pricediscovery.