During difficult economic times, researchers expect to uncover significant numbers of people who find it difficult to afford the food that their families need. In developing countries, nearly half of those surveyed by Pew fell into this category. In emerging nations, the number drops to about 25%. In wealthier countries, the number (as you’d expect) drops dramatically. The United States is the outlier. It’s the richest country in Pew’s survey, yet 24% of Americans had trouble putting food on the table in the last year.