Migration is often blamed for unemployment. The fear that there are too many migrants stealing jobs has almost certainly helped with the rise of UKIP and the election of President Trump. But is there any value in this far right rhetoric, or is conventional economy theory right for once – that migrants create demand that facilitates more jobs and adds to the economy. And are we getting so lost in the migration and employment debate that we’re missing a far bigger concern – the number of people on the planet.

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