The share of income spent on food has plummeted in the US
One reason the huge amount of economic progress made globally in recent decades gets ignored is that living standards for the median American have been fairly stagnant. One exception to that pattern, however, is the fact that cheaper food has freed up Americans to spend more on other expenses. "Between 1960 and 2007, the share of disposable personal income spent on total food by Americans fell from 17.5 to 9.7 percent, and the share of income spent on food at home fell from 14.1 to 5.6 percent," the USDA notes, and they've stayed at that low level since.