Every February, Valentine’s Day amplifies what single people already know – that public life is built for two. Restaurants roll out prix fixe menus for couples. Hotels promote “romantic getaway” packages designed for double occupancy. A table for one still invites the question, “Just you?”

Yet there’s irony that’s hard to miss. While Valentine’s Day doubles down on togetherness, more adults are living – and moving through the world – alone.

As a behavioral economist, I study what I call the “solo economy.” A growing share of economic life today is organized around people who live, spend and make decisions on their own.

Half of U.S. adults are unmarried, and one-person households are now the nation’s most common living arrangement. This isn’t a temporary phase confined to young adults waiting to settle down. It includes never-married professionals, divorced empty nesters, widows and widowers, and people who simply prefer to live independently.

Lifelong singlehood is also rising: 25% of millennials and 33% of Gen Z are projected to never marry.

It’s a slow-moving demographic shift away from long-term partnership as the dominant adult life path, but a consequential one – reshaping everything from housing and travel to social policy and commerce. One of its clearest expressions is the number of people doing things alone in public.

It would be one thing if the economy were built for two and solos stayed home. But they are going to museums, traveling and, of course, dining alone in restaurants. To assess this behavior, I surveyed single and married Americans about their participation in 25 activities that occur in public – from shopping and dining to attending movies and concerts.

The pattern was striking. Overall, singles were much more likely to do things........

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