Ruschlikon is a village in Switzerland with a very low tax rate and very wealthy residents. There is so much money in the public coffers that mayor can't spend it all, largely thanks to the contribution from one resident - Ivan Glasenberg, CEO of commodities giant Glencore. However, Glencore's copper mines in Zambia don't generate similar tax windfalls for Zambians. The country has the third largest copper reserves in the world, but 60 per cent of the population live on less than $1 a day and 80 per cent are unemployed. Christoffer Guldbrandsen investigates the dark heart of the tax system employed by multi-nationals and asks how much profit is fair.

Source: BBC