Jackson and Jackson pinpoint the following disadvantage/s of the 'single-member plurality' electoral system: Question 2 options: it shows an arithmetic tendency to favour the smaller parties with a' bonus' for the smallest party the system does not distribute seats in the Commons on the basis of the popular vote but does tend to favour the development of a one-party dominant system it favours the development of a multi-party system it favours, in Canada, the development and maintenance of a one-party dominant system the popular vote does not determine the seat allocation in the House of Commons