How big can Aldi get in Australia? And how much secrecy is too much?

Billions of dollars in undeclared and untaxed wealth hidden offshore has been revealed by hundreds of rich Australians as they rush to take advantage of the ATO's last-ever tax amnesty.

Crowd-sourced equity funding to help start-ups in Australia looks a step closer, with the Abbott government releasing a new discussion paper.

Local stocks sink, led down by a rout in the energy sector as BHP plunges below $29 and Santos crashes, while the dollar dives again as NAB joins the rate-cut camp.

The Australian dollar is edging closer to a 70s-handle, dropping to a new four-year low of US82.35¢ on Tuesday on the back of poor business confidence figures and another major bank switching into the rate cut camp.