Hillary Rodham Clinton calls them “everyday Americans.” Scott Walker prefers “hard-working taxpayers.” Rand Paul says he speaks for “people who work for the people who own businesses.” Bernie Sanders talks about “ordinary Americans.”

The once ubiquitous term “middle class” has gone conspicuously missing from the 2016 campaign trail, as candidates and their strategists grasp for new terms for an unsettled economic era. The phrase, long synonymous with the American dream, now evokes anxiety, an uncertain future and a lifestyle that is increasingly out of reach.

The move away from “middle class” is the rhetorical result of a critical shift: After three decades of income gains favoring the highest earners and job growth being concentrated at the bottom of the pay scale, the middle has for millions of families become a precarious place to be.

A social stratum that once signified a secure, aspirational lifestyle, with a house in the suburbs, children set to attend college, retirement savings in the bank and, maybe, an occasional trip to Disneyland now connotes fears about falling behind, sociologists, economists and political scientists say.