Resurgent house prices and sharemarkets show no signs of becoming unsustainable bubbles despite record cheap money for years ahead, says Reserve Bank governor Philip Lowe, following the central bank’s move to buy another $100 billion in government bonds this year.

After five months of house price rises nationally and surging stocks, the RBA said there was “a high degree of confidence” it would keep the 0.1 per cent cash rate target at a record low for up to four years. But some economists are concerned this could soon create dangerous asset price bubbles.