Advantages of BV
The Block Vote is often applauded for retaining the voter’s ability to vote for individual candidates and allowing for reasonably-sized geographical districts, while at the same time increasing the role of parties compared with FPTP and strengthening those parties which demonstrate most coherence and organizational ability.
Disadvantages of BV
However, the Block Vote can have unpredictable and often undesirable impacts on election outcomes. For example, when voters cast all their votes for the candidates of a single party, the system tends to exaggerate most of the disadvantages of FPTP, in particular its disproportionality. When parties nominate a candidate for each vacancy in a Block Vote system and encourage voters to support every member of their slate, this is particularly likely. In Mauritius in 1982 and 1995, for example, the party in opposition before the election won every seat in the legislature with only 64 per cent and 65 per cent of the vote, respectively. This created severe difficulties for the effective functioning of a parliamentary system based on concepts of government and opposition. The use of ‘best loser’ seats in Mauritius only partially compensates for this weakness.
In Thailand, the Block Vote was seen as having encouraged the fragmentation of the party system. Because it enables electors to vote for candidates of more than one party in the same district, members of the same party may be encouraged to compete against each other for support. The Block Vote was thus sometimes seen in this country as being a contributor to internal party factionalism and corruption, which eventually led to its replacement.
Besides Thailand, some other countries have abandoned the Block Vote in favour of other systems. Thailand and the Philippines both changed from BV to a mixed system in the late 1990s. In both cases, a major justification for the change was the need to combat vote-buying and strengthen the development of political parties.
