Since the emergence of capitalism, workers seeking higher pay and safer workplaces have banded together in guilds and unions to pressure their employers for a better deal. That has been the approach of the American labor movement for the past 200 years.

That approach, however, has begun to change. It’s not because unions think collective bargaining is a bad idea but because workers can’t form unions any more — not in the private sector, not at this time. There are some exceptions: Organizing continues at airlines, for instance, which are governed by different organizing rules than most industries. But employer opposition to organizing has become pervasive in the larger economy, and the penalties for employers that violate workers’ rights as they attempt to unionize are so meager that such violations have become routine. For this and a multitude of other reasons, the share of unionized workers in the private sector dropped from roughly one-third in the mid-20th century to a scant 6.6 percent last year. In consequence, the share of the nation’s economy constituted by wages has sunk to its lowest level since World War II, and U.S. median household income continues to decline.

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