The rise of dual-career couples has contributed to lower mobility rates between cities and has made it harder to recruit workers to smaller job markets.

Why it matters: Moving to a different town for a job opportunity was more common when most households had one primary earner. Now that the majority of households rely on two incomes, relocating requires finding two good jobs instead of one — a much harder proposition for many couples.

More than 60% of all U.S. households have two working parents, according to Pew Research Center. White-collar workers are more likely to be part of households where both partners work full time.

Where it stands: Fifty years ago, the main requirement for relocating was

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