Once again, if you’re a rugged individualist, or organization averse, let us emphasize that you don’t have to be a member of a union to benefit. For example, taking a look at one business, “for a 10% increase in local union densities in the supermarket industry it is estimated that the wages of union employees in that labor market will increase by 5.3% and by 1.2% for nonunion.” So if you’re not in a union, but union membership rises, especially if it’s in a profession like your own, yours will likely rise, too.
Source : The Nation
Collected Reading 