misperceptions as much as our misperceptions creating our concern. For Britain, this is likely to be part of the explanation for people’s huge overestimates of how much the wealthiest own, how many young people are still living at home and what proportion of the population are immigrants (the guess is 25%, when it is really only 13%, according to official estimates). People are worried about the concentration of wealth, the housing pressures facing young people and immigration levels, and this is reflected in them overstating the scale of the issues. But, the survey suggests there are also some issues where people are not as worried as they should be. For example, most countries hugely underestimate how much of their population is overweight or obese. The worst case is Saudi Arabia, where people think only 28% are, when 71% are. Britons think it is 44%, when it is actually nearly half as much again – 62% are either overweight or obese. And, in many ways, it is not our misperceptions but these realities across different countries that are the most interesting and important aspects of the study. The top 1% in Russia own 70% of the nation’s wealth, while the top 1% in New Zealand only own 18%. Half of Italians aged 25-34 still live with their parents, when it is only 4% in Norway. The average age in India is 27; it is 47 in Japan. Only 10% of politicians are women in