It was a major blow for the Singapore Stock Exchange (SGX). Its courtship for its Australian counterpart, the Australian Stock Exchange (ASX), came to an abrupt end when the Australian government rejected the deal last week saying it was not in Australia's national interests. SGX was left standing alone at the altar.

It is a rather courageous move for Australia to turn its back on a suitor willing to pay more than 35% premium for each ASX share. Stock exchanges all over the world are forging alliances, and this fundamental power shift is threatening to isolate ASX.