Identify the advantages of a two-party system both to voters and to a
political system.

Here are some advantages of a two-party system:

-- Multiparty systems tend to encourage regional voting, so a
two-party system will tend to have some support from throughout a
country or other electoral unit.

-- Two-party systems tend to be quite stable and predictable (although
obviously not as stable as a one-party system, which has obvious
disadvantages).

-- With two parties, the candidate who wins almost always has a
majority of the votes or close to it.  In some other systems, a
candidate can be elected even though supported by a small minority.

-- Both parties in a two-party system tend to see broad support and
thus tend to become politically moderate and better able to rule.  In
the USA, for example, both major parties have solid bases they can
count on, so they seek support from the center.

-- A two party system prevents the inequities of split voting.  For
example, suppose there are two conservative parties and a liberal
party. If the two conservative parties divide the conservative vote, a
liberal party could win even though most voters are conservative.

-- In a two-party system, it is common for one party or the other to
co-opt ideas that have little support. In a multiparty system, a
minority platform plant may not gain support outside the party that
advocates it.

Here are some articles that provide further information:

Two-party system (Wikipedia)
http://www.wikipedia.org/wiki/Two-party_system

Political Failure and Political Parties
http://www.geocities.com/Athens/Olympus/2178/parties.html

The Problem with Instant Runoff Voting
http://electionmethods.org/IRVproblems.html

I hope this helps.

Sincerely,

mvguy-ga






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thank you for your help