[4]  http://www.rba.gov.au/speeches/2017/sp-dg-2017-11-13.html  5/13  13/11/2017  Business Investment in Australia | Speeches | RBA  Graph 5  Weak economic growth An obvious candidate to explain the post-crisis behaviour of investment is weak aggregate demand. Research finds that much of the weakness in global investment since the crisis can be explained by slower economic growth.
[5] However, when we look at this in Australia, while the explanation clearly has a lot of attraction, there is less clear-cut evidence for non-mining business investment. Investment spending in the non-mining sector has been even weaker than predicted by our standard aggregate model.