More spending in these areas won’t necessarily buy us more mobility. The public-sector workplace has become a kind of artificial Eden, whose fortunate inhabitants enjoy solid pay and 1950s-style job security and retirement benefits, all of it paid for by their less-fortunate private-sector peers. Some on the left have convinced themselves that this “success” can lay the foundation for a broader middle-class revival. But if a bloated public sector were the blueprint for a thriving middle-class society, then the whole world would be beating a path to Greece’s door.

Our entitlement system, meanwhile, is designed to redistribute wealth. But this redistribution doesn’t go from the idle rich to the working poor; it goes from young to old, working-age savings to retiree consumption, middle-class parents to empty-nest seniors. The Congressional Budget Office’s new report on income inequality points out that growing Medicare costs are part of the reason upper-income retirees receive a larger share of federal spending than they did 30 years ago, while working-age households with children receive “a much smaller and declining share of transfers.” Absent reforms, this mismatch will only grow more pronounced: by the 2030s, Medicare recipients will receive $3 in benefits for every dollar they paid in.

Then there’s the public education system, theoretically the nation’s most important socioeconomic equalizer. Yet even though government spending on K-to-12 education has more than doubled since the 1970s, test scores have flatlined and the United States has fallen behind its developed-world rivals. Meanwhile, federal spending on higher education has been undercut by steadily inflating tuitions, in what increasingly looks like an academic answer to the housing bubble. (If the Occupy Wall Street dream of student loan forgiveness were fulfilled, this cycle would probably just continue.)