It's Davos week. Appropriate growth has to be on the agenda of all present. But so too does something else, and that's tax evasion.

Tax evasion costs the world US$3.1 trillion a year in my estimation - at least 5% of world GDP. and we could stop some of it. I never pretend all of it: that's impossible. But stopping some of it would radically restructure the economies of the world with special benefit for the poor.

In that case it's good to see my Task Force on Financial Integrity and Economic Development  colleague Nick Mathiason in the Guardian today explaining five ways to tackle global tax evasion. Please read what he has to say, here.