oThe size of the gap varies from year to year.
During periods of higher unemployment, the impact of unions is
larger.
During strong economies, the union-nonunion gap is smaller.
Part of the explanation for this time-based phenomenon is related to
union resistance to wage cuts during recessions and the relatively slow
response of unions to wage increases during inflationary periods
(because it is hard to respond quickly when a union is tied to a
multiyear labor contract).
Union employees in the public sector earn, on average, about 22 percent
more than their nonunion counterparts.
However, historically, this figure masks some large variations across
unions, depending on the occupation(s) they represent.
The largest gains for public sector employees are reported for
firefighters. At the other extreme, however, teachers’ unions have not
fared as well, with reported impacts generally in the range of 1 to 4
percent.
In recent years, wage concessions have become more prominent.
oSome experts claim these concessions are more common in unionized
firms and that this reduces the advantage union workers hold in wages,
particularly during downturns in the economy.
For example, in 1908 the glass-bottle blowers accepted a 20 percent
wage cut in the hopes of fighting automation.
During the 1930s, concessions were a regular feature in the
construction, printing, and shoe industries.
Concessions were also made in the apparel and textile industries
during the 1950s.
More recent trends in public sector legislation don’t bode well for
unions. In 2012 Michigan joined Wisconsin and Indiana in giving
workers the right to not join unions as a condition of employment.
B. The Structure of Wage Packages
One dimension of the union impact on the structuring of wage packages
concerns the division between direct wages and employee benefits.
oResearch indicates that the presence of a union adds about 30 to 40
percent to employee benefits.
oWhether because of reduced management control, strong union-worker
preference of benefits, or other reasons, unionized employees also have a
greater percentage of their total wage bill allocated to employee benefits.
Typically, the higher costs show up in the form of higher pension