Many fear that PR will lead to the multiplication of small parties and consequently to chaos in the House of Commons. Experiences have demonstrated that marginal parties are only a source of chaos if the threshold to obtain a seat is low. Consequently it is easy to prevent that eventuality. In Germany, for instance, where the threshold to obtain a seat is 5%, there are only five parties in the national legislature. In Canada’s case, where there are already five elected parties in the House of Commons, it is very unlikely that the number of parties would become excessive.
As a matter of fact, the election of a larger proportion of candidates from small parties is desirable, as it would be more conducive to coalition governments which tend to be more stable. To understand why, click here.