Investors are bracing for the wildest ride since the Brexit vote across stocks, bonds and currencies on Monday as speculation intensifies that central banks have reached a turning point in their ceaseless efforts to simulate markets.

While the news will be welcomed by the Reserve Bank of Australia, as it would mark an end to the worsening currency war that has pushed official rates to record lows, prospects of a reversal in support is expected to send what some see as overpriced markets into reverse.