Alexia Russell

The World Inequality Lab has produced what it's called a radical plan, where it proposes transforming how we live on a finite planet so that nearly everyone gains.

A wealth tax on the world's billionaires would pay for an organisation that would fund energy solutions for

to bring down the planet's temperatures.

There'd be a change in focus from sectors such as industry and mining to education and health.

It would be a world where we would eat less red meat and work fewer hours and where most people would have more money.

It would also mean developed nations essentially being happy with what they've got instead of constantly consuming more.

The concept of sufficiency.

And we'd stop using GDP to measure our success.

Could it work?

Hi, I'm Alexia Russell, and today on The Detail, the Global Justice Report, which came out this month.

It may stand out as a message of hope, but what's the point if no one's listening?

Even one of the report's authors describes it as visionary and maybe utopian.

But if we don't toss these ideas around and take notice of some of the best economic brains in the world, nothing would ever change.

So let's get into it.

Later, I'm talking to Max Rashbrook, an adjunct research fellow in the School of Government at Victoria University of Wellington, about what he calls an extraordinarily ambitious project.

First, though, Arthur Grimes is a professor of wellbeing and public policy at the same place.

He's also a senior fellow at Motu Research, New Zealand's leading economic think tank, and he's a former Reserve Bank chairman and chief economist.

I started by asking him why we do still use GDP as our measure of success.

NNI, we should be saying NNI, not GDP.

Do they mean productivity?