We examine cyclicality of strike frequency and incidence, using Canadian data on strikes and contracts. Total strike frequency exhibits significant procyclicality, to which within-contract strikes contribute appreciably. Evidence is weaker for procyclical behavior of contract-expiry strikes, both in total and disaggregated by issue. Strike incidence is also procyclical, particularly in manufacturing, though the procyclicality here is confined to strikes over nonwage issues. These results mirror those obtained by analyzing the frequency of strikes in the contract data. Industry-specific cyclical variables positively affect strike incidence in manufacturing, but region-specific variables have no effect.

Canadian data on strikes between 1946 and 1983 are used to estimate linear regression models for the logarithm of completed duration. A thorough investigation of the influence of the business cycle reveals strong support for the hypothesis that strike durations are countercyclical. The cyclical effect is shown to be robust to both the choice of cyclical variable and the econometric specification, and the magnitude of the effect is quite substantial. Experimentation with different representations of the cycle reveals that it is difficult to improve on a simple formulation involving a single continuous variable.