This week the prime minister entered full marketing mode.

Scott Morrison’s topic was climate change and his plans to get to net-zero.

At the Victorian Chamber of Commerce and Industry on Wednesday, he tried out a few slogans.

Among those he test marketed:

• can do capitalism, not ‘don’t do governments’

• no one passed a law or introduced a tax or passed a resolution at the UN that led to the world developing a COVID vaccine, no one passed a law for the world to move digital, Google and Cochlear were not invented at a UN workshop or summit

• Australia has already reduced our emissions by more than 20%, now, our emissions are going down, not up, they’re down by more than 20%

He said a bunch of other stuff, but those are my top three.

He wants to contrast his approach with certain United Kingdom and US environmentalists, who do indeed want to restrict what people can buy or do. Ideas like mandatory “meatless Mondays” and banning advertising for SUVs do indeed have no place in Australia, or even in the UK for that matter.

Read more: Economists back carbon price, say benefits of net-zero outweigh costs

And nor does telling people where to drive, although the prime minister assured us he was not going to tell people “where to drive or where they can’t drive.

Economists don’t like such ideas either. The whole idea behind a price on carbon (whether through a carbon tax or a system of tradable permits) is to respect people’s preferences, while making sure their decisions take account of the costs they impose on others.

Innovations often come from government

His second claim was that innovation (things like the COVID vaccine, Google search and digitisation) isn’t sparked by governments.

While it’s true that "Google and Cochlear were not invented at a UN workshop or summit”, to suggest that governments played no role is to wilfully ignore history.

The miraculous Moderna mRNA vaccine was developed… checks notes… in partnership with the US National Institutes of Health. Moderna received nearly US$10 billion in taxpayer funding.

Much of the work on the Cochlear ear implant was done at the largely government-funded University of Melbourne; the internet revolution grew from the US Department of Defense’s Advanced Research Projects Agency; and Google’s search algorithm was developed by fully-funded graduate students at Stanford University, whose endowment is tax exempt.

Very often, cuts in emissions come from government

Morrison emphasised on Wednesday that Australia has reduced emissions by 20%.

It’s natural to ask what brought it about. Much of it was a cutback in land clearing, which is counted as emissions reduction under the rules. Land clearing is regulated by government.

Much of the rest happened during the two years Australia had a carbon price in place, as this chart shows.

Australian emissions excluding land use, land-use change and forestry