In a meritocracy more people can do jobs that match their skills, making them more productive. It’s not just good for them, it’s good for the economy too. So how effective are the policies that try to make countries more meritocratic? Oriana Bandiera and Ilse Lindenlaub tell Tim Phillips how much productivity countries are sacrificing because the wrong people are in the wrong jobs, which countries are most meritocratic, and how we can best help the others to catch up.