The first reason we're working less is that we just suffered a huge recession, and Washington all but abandoned its efforts to heal the labor market. Even with jobless benefits, unemployment stresses poverty in a straightforward way. The poverty rate for full-time workers is very low: 3 percent. For those who don't work, it's very high: 33 percent...

... as you could guess, when more people move from working to not working—that is, when they move from the left column in this graph to the right—it naturally raises the poverty rate. Today, even with unemployment falling, the share of working-age people who are actually working (a.k.a.: the labor force participation rate) has retreated to its lowest point since the 1970s, partly because America is aging and partly because people have dropped out of the workforce.

The second reason we're working less is that family arrangements—in particular, the rise of single-parent households—make it all but impossible for many parents to work full-time.

The poverty rate among married couples is quite low: 6 percent. The poverty rate among single-dads/moms is quite high: 25/31 percent. Since the share of single-parent households doubled since 1950, we should expect it to stress the poverty rate, especially since low-income people closer to the poverty line are less likely to marry, in the first place.

Things get really interesting when you zoom into the marriage picture. Among what you might consider "modern families" (e.g. the 61 million people married and living together, both working), there is practically no poverty. None. Among marriages where one person works and the other doesn't (another 36 million Americans) the poverty rate is just under 10 percent.

But take away one parent, and the picture changes rather dramatically. There are 62 million single-parent families in America. Forty-one percent of them (26 million households) don't have any full-time workers. This is something beyond a wage crisis. It's a jobs crisis, a participation crisis—and it's a major driver of our elevated poverty rate. [In the graph below, FTRY=full-time, year-round worker; PT=part-time]

Poor, single-parent family households are, above all, starved for time. So they only work part-time. Of the 46 million families led by a woman with no husband present, only 52 percent percent have even one full-time, year-round worker. (For married couples of all ages, it's 76 percent. No surprise, then, that these families are five-times less likely to be in poverty than the national average.)

One thing that economists (and Lowrey) point out is that government policies have been more effective at helping families escape poverty than we think. Indeed, one study found the growth of government benefits since 1967 has cut an alternative measure of poverty by 40 percent. But it's more precise to say that Washington has been effective at helping working, two-parent families escape from poverty. The problem is that there are fewer people working and fewer two-parent families. Both the great recession and the surge of single-family households have made it harder for people, today, to work full-time. And families cobbling together a life from part-time gigs, or unemployment, are much more likely to dip into poverty.

It's not realistically (or desirably) in Washington's power to force parents to get married and stay together. But raising employment during a slack economy is precisely within its power. It's just a power Congress chose to stop using.

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*Not all poverty programs are for workers. In fact, the government's most successful anti-poverty program is arguably Social Security, at least as measured by the amount it reduces poverty among seniors.