Being paid the same amount of money to work fewer hours is a strong pitch, so it's easy to see why workers might support a four day week.

Surprisingly though, there's also growing evidence that it'll boost overall productivity.

The four day working week is being trialled from Iceland and Spain to the US and Scotland, with more places contemplating the model.

So if it's a win for businesses and workers, then why isn't it already everywhere?

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Professor Juliet Schor, Economist and Sociologist, Morrissey College of Arts and Sciences, Boston College, Boston, US