"Part-time employment growth in the United States and Canada followed similar trends between 1955 and 1975, which then diverged when part-time employment (as a percent of total employment) stopped growing in the United States but continued to expand in Canada. This divergence in trend in the latter part of the twentieth century is not adequately explained by labor supply demographics, labor demand factors, or union effects. To the contrary, differences in public policy played a pivotal role in allowing Canadian workers to continue to view the choice of shorter hours as attractive, while US workers faced higher costs when choosing part-time employment."

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