Soon, a pattern was evident, thanks in part to real-time monitoring by the U.S. Census Bureau: When Washington doled out federal aid, hardship declined. When Washington let aid expire, hardship ticked back up.

In essence, the pandemic triggered a country-wide policy experiment aimed at keeping families fed and financially afloat. There have been big increases in food stamps and unemployment benefits. Three rounds of stimulus checks. Universal free meals at schools and new grocery benefits for kids who are learning virtually, or out of school during the summer. Hundreds of millions of food boxes flooded into churches and other nonprofits.

The latest tranche of aid may carry the biggest bang yet: six monthly child tax credit payments that will be dispersed through the end of the year. The first two rounds of payments that went out in July and August fueled a dramatic reduction in the rate of American households with kids who report sometimes or often not having enough to eat in the past week, according to the Census Bureau.

All that aid appears to have worked.