It is very difficult to accurately detect, verify, or track the data that would be needed to test these hypotheses. Short of any outright auditing (which has no legally justifiable basis), firms have a fair amount of plausible deniability. As for the concern that productivity growth drives unemployment, the very idea is controversial, and it depends on whatever the true reality may be in the relationship of automation to unemployment. Certainly a pattern of multiple jobless recoveries, where GDP grows while employment stagnates, makes the public wonder about firms' assurances that all layoffs are necessitated by business conditions alone.
