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Why are there so many stock exchanges in the world?
Why are there so many stock exchanges in the world?  The simple answer is that there is a lot of money to be made by charging fees to facilitate the trading of securities, but there are other factors at play here relating to new technologies. Trading volumes have increased rapidly in recent years.  According to this ITG data, in 1997, 6.5 billion shares were traded on US exchanges.  By 2015 this number had increased to 40.8 billion shares.  There are a number of reasons for this rapid increase in volumes.  Most significant would be the introduction of new technologies that allow for high volume, high frequency trading. This increase in activity has be accompanied by an increase in the number of stock exchanges.  As CQM points out in his answer, there has been considerable consolidation in the ownership of "legacy" exchanges.  For example, the NYSE merged with EuroNext in 2007, and the combined group is now owned by the Intercontinental Exchange, which also owns numerous smaller stock exchanges as well as a number of derivative/commodities exchanges. However, this consolidation in ownership has been more than matched by the creation of many "virtual" exchanges.   In North America these virtual exchanges are called "Alternative Trading Systems".  In Europe, they are called "Multilateral Trading Facilities".   These new virtual exchanges, sometimes referred to as "dark pools", have begun to significantly eat away at the volumes of the legacy exchanges.  If you look at the ITG data (linked above), you will see that the total volume of shares traded on legacy exchanges actually peaked in 2008, and has since then has decreased.  This coincides roughly with the appearance of the virtual exchanges and the new high frequency trading methods.  According to this paper from the SEC site, dated 2013, Alternative Trading Systems accounted for 11.3% of total volumes in 2012.  This will have increased rapidly in the years since 2012.  It is this loss of business that has prompted the consolidation in the ownership of the legacy exchanges. These new exchange are "conceptually the same" as the legacy exchanges and must play by the same regulatory rules.