Tax issues at the heart of Davos summit

Governments in the developed world want to ensure corporations and people pay the taxes they owe.

Last year global leaders promised to limit the role of tax havens. But has this managed to increase income for governments?

Sally Bundock spoke to Mark Weinberger of EY, which is one of the largest tax advisory firms in the world.

She asked him what was being done to get the likes of Google and Facebook to pay more tax.