It's hard to imagine how such commitments might be maintained, which suggests that fines are more effective than boycotts, especially if they are written into law rather than imposed on an ad hoc basis.
Boycotting works better than any fine will. 
mnli hypothesis: Boycotting works better than any fine will.  premise: It's hard to imagine how such commitments might be maintained, which suggests that fines are more effective than boycotts, especially if they are written into law rather than imposed on an ad hoc basis.