The City Council’s passage of a citywide mandatory paid sick leave bill is not a cause for celebration.

A study by the Institute for Women’s Policy Research — a group supportive of paid sick leave laws — found that nearly 30% of San Francisco’s lowest-wage employees reported layoffs or reduced hours at their place of work following that city’s passage of a paid leave mandate. Another survey by the Urban Institute found that some city employers had scaled back on employee bonuses, vacation time, and part-time help to adapt to the new law’s higher costs.

It’s a helpful reminder that when it comes to business mandates, good intentions don’t necessarily lead to good policy.