From the Australian Financial Review … the RBA concern in a nutshell (bolding mine):

  • Investor borrowing growing last month at the fastest pace in more than six years
  • In a fresh sign of an investment housing boom that has raised alarm bells at the Reserve Bank of Australia, credit for buy-to-let properties rose 0.8 per cent in August, taking the annual gain to 9.2 per cent – the most since March 2008, before the global financial crisis
  • RBA “officials are increasingly concerned the investor frenzy could be creating a house-price bubble that may trigger economy-wide fallout if it and when it bursts”

Investor borrowing jumps to six-year high (gated)

Hmmmm says Mr. S

“Hmmmm” says Mr. S