Using two Canadian data sets, the authors explore the role of union co
verage in displaced workers' wage losses. While only 32% of the worker
s had unionized jobs prior to displacement, the wage loss suffered by
these workers represented about 80% of the wages lost by all displaced
workers in both samples. Losing union status was associated with larg
e losses whether or not a worker switched industries after displacemen
t. Extrapolating the results to the United States, the authors estimat
e that one-third to one-half of U.S. displaced workers' wage losses ma
y be due purely to the loss of union coverage.