"Whats the difference economically between a carbon tax @ $23 per tonne and ETS @$23 per tonne?"
More importantly, what is the difference economically when the fixed price is suddenly changed to the market driven ETS price, if the ETS price happens to be significantly above what Gillard and ALP thought it might be in 2015?
Imagine Australia suddenly grinding to a halt and the effects on inflation if CO2 suddenly went from $23/tonne to $80/tonne overnight?