# Single Transferable Vote

Delve into the intricacies of the Single Transferable Vote, a system extensively employed worldwide, from defining its essential tenets to accurately calculating and understanding its workings. Garner insights into its potential advantages that foster increased representation and its potential hurdles which can complicate electoral processes. Compare it with the Alternative Vote system and explore how it stands against it concerning effectiveness. Finally, take a comprehensive look at its applications around the globe, assessing the real-world impact it has had in different nations.

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## Understanding the Single Transferable Vote System

You might often hear the term Single Transferable Vote (STV) during election periods. This is because it's a common voting system employed in democratic societies worldwide. Let's explore its specifics in detail.

### Definition of the Single Transferable Vote

The Single Transferable Vote is a voting system designed to achieve proportional representation in multi-seat constituencies.

In fact, STV is a preferential voting system, where you, as a voter, rank candidates in order of preference, rather than merely choosing a single candidate.

#### Key Elements of the Single Transferable Vote

Understanding the STV requires getting a handle on a few key elements. Let's have a look:

• Preferential voting: This allows you to rank candidates according to your preference.
• Quotas: A vote quota or threshold delineates the minimum number of votes necessary for a candidate to secure a seat.
• Vote transfer: Excess votes or lowest-scoring candidates' votes are redistributed according to you and other voters' second preference.

### Detailed Example of Single Transferable Vote

Sometimes, the best way to comprehend a complex system like the STV is to see it in action through an example:

Imagine there are three seats to be filled and four candidates are running: candidate A, candidate B, candidate C, and candidate D. Now, suppose the election results are as follows:

 Candidate First Preference Votes Second Preference Votes A 40000 15000 B 25000 20000 C 18000 21000 D 17000 25000
How would STV work in this situation? Let's dive in further in the next section.

#### Step-by-step Calculation of Single Transferable Vote

Let us break down the calculation of the STV system in our previous example. Firstly, the electoral quota in an STV system can be computed using the Droop Quota as follows:

$\text{Quota} = \frac{\text{Total Valid Poll} + 1}{\text{Number of Seats} + 1} + 1$

Given our example earlier, the total valid poll is 100,000 votes, and the number of seats is 3. Insert these values into the formula and the result is approximately 25,001 votes: the number of votes a candidate needs to secure a seat.

In our example, candidate A already exceeds the quota and secures a seat. The excess votes (in this instance, 15,000) are then redistributed according to second preferences. This process continues until all seats are filled.

## Pros and Cons of the Single Transferable Vote

Like any other voting system, the Single Transferable Vote presents both advantages and drawbacks that you should consider. Understanding these can help you gain a deeper insight into the overall system. Let's embark on this analysis.

### Advantages of Single Transferable Vote

The Single Transferable Vote (STV) provides several advantages to enhance democratic representation for you and other voters.

STV promotes proportional representation, meaning the distribution of votes better reflects voters' preferences. This is one of the remarkable qualities that separates it from other voting systems.

• Ensuring minority representation: Since no vote goes to waste in the STV system, minority groups have a better chance of being represented.
• Eliminating tactical voting: Unlike 'first-past-the-post' systems, STV mitigates the issue of tactical voting. You vote according to your true preference rather than trying to manipulate the results.
• Promoting variety: With STV, multiple candidates can represent the same political party, encouraging diversity in representation and candidate choice.

#### Increased Representation through Single Transferable Vote

One of the most significant benefits of STV is its capacity to increase representation. Now, you might wonder, "How exactly does it do this?" Allow us to explain.

Let's recall our previous example where there were 100,000 votes for four candidates A, B, C, and D. Now, say candidate A is from a minority group, receiving 20,000 votes. In a simple majority electoral system, candidate A would not have a voice due to less vote count. However, using the STV system, candidate A's votes can be transferred according to voters' second preferences, improving the chances of a win. This demonstrates how STV can amplify minority representation.

### Disadvantages of Single Transferable Vote

While STV introduces some potent advantages, it also brings a series of potential challenges. Three main ones include:

• Complexity: The process of counting and re-allotting votes in STV can become complex and time-consuming, especially for larger elections.
• Confusion among voters: The preferential voting system may confuse some voters, especially those accustomed to 'one person, one vote' systems.
• Partial representation: Although the STV system promotes diversity, it can sometimes lead to a lack of clear mandate for a single party, resulting in coalition or minority governments.

#### Potential Complications with Single Transferable Vote

Let's delve deeper into the drawbacks of Single Transferable Vote, focusing on the potential complications aspect.

The redistribution of votes in an STV system can potentially lead to the paradox of non-monotonicity. This means that a candidate who gains more primary votes can paradoxically lose the election due to the transfer of other candidates' excess votes. This can create confusion and raise questions about the intuitive fairness of the voting system.

## Comparative Review: Single Transferable Vote vs Alternative Vote

A comprehensive understanding of the Single Transferable Vote (STV) system would be incomplete without comparing it to other voting systems. One such system is the Alternative Vote (AV) method, another popular preferential voting system. In this section, let's embark on an enlightening journey comparing STV and AV.

### Major Differences between Single Transferable Vote and Alternative Vote

At first glance, the Single Transferable Vote and the Alternative Vote may seem quite similar due to their shared aspect of preferential voting. However, important differences distinguish the two voting systems:

• Seat allocation: STV is used for elections with multiple seats in a constituency. In contrast, the AV is designed for single-seat constituencies.
• Vote transfer: STV has a more comprehensive system for vote transfers, ensuring that excess votes or votes from eliminated candidates are not wasted, contributing to the win of other candidates. On the other hand, AV relies only on the votes of eliminated candidates.
• Representation: STV can result in more proportionate representation, as several candidates may win from a constituency compared to AV, where only one candidate becomes a representative.

Alternative Vote (AV), also known as Instant-runoff voting (IRV), is a voting method that allows you, as a voter, to rank candidates in order of preference, like in an STV system. However, in an AV system, a candidate must secure more than half of the valid votes to win. If no candidate reaches this threshold in the first count, the candidate with the fewest votes is eliminated and their votes are redistributed according to voters' second preferences. This process repeats until a candidate surpasses the majority threshold.

#### Assessing the Effectiveness: Single Transferable Vote vs Alternative Vote

Now that you're aware of the differences between STV and AV, let's dive into an effectiveness assessment to see how these descriptors play out in real-world scenarios.

Picture three candidates running for a single seat in a constituency; Alice, Bob, and Charlie. 10,000 people vote and the distribution is as follows:

 Candidate First Preference Votes Second Preference Votes Alice 4000 4000 Bob 3500 0 Charlie 2500 6000
In an AV system, Charlie, with the least votes, gets eliminated in the first round. His votes (2,500) are redistributed according to voters' second preferences. If Bob is the second preference for all of Charlie's voters, Bob's total vote count goes up to 6000, and he wins the seat. But let's consider a scenario where we are electing two representatives instead. For this, we use the STV system with the same vote count. Using the Droop quota formula - $\text{Quota} = \frac{\text{Total Valid Poll} + 1}{\text{Number of Seats} + 1} + 1$ This results in a quota of approximately 3,334 votes. Here, Alice secures a seat in the first round, and her surplus votes (667) get transferred. Now, suppose all Alice's excess votes have their second preference as Charlie, this brings his total to 3,167. The process is repeated, and all of Bob's votes (assuming all have second preference as Charlie) get transferred to Charlie, surpassing the quota and securing the second seat. This scenario illustrates that the STV and AV systems, while similar in preferential voting, can yield different election results, displaying the effectiveness of each system in different contexts.

## Applications of Single Transferable Vote Worldwide

The Single Transferable Vote (STV) system finds diverse applications across the globe. It helps in diverse situations, like electing representatives in countries that value proportional representation, to even electing leaders in non-governmental organisations.

### Countries that Use Single Transferable Vote

Did you know that several countries implement some form of the STV system? These nations vary broadly from Ireland, Australia, to Malta. Each utilise the STV in their voting systems to better represent you and your fellow voters' preferences.

For instance, Ireland has used the STV system for its lower house parliamentary elections since 1921. Its fair form of proportional representation has seen success across the country and even Ireland's constituent universities.

• Australia: Australia uses a variant of the STV, notably for its Senate elections. Here, members are elected in multi-seat constituencies, with each state acting as a separate voting territory.
• Malta: Malta has been using the Single Transferable Vote since 1921 for its main general elections. The country's avid commitment to this voting system has made its democracy strong and vibrant.

Moreover, the STV is also used for local elections in Scotland and New Zealand, demonstrating its versatility across different governmental levels. The STV's adaptability and its core focus on proportional representation make it a popular choice in many democratic societies.

#### Impact of Single Transferable Vote in Different Countries

The implementation of the STV system has produced a significant impact on the political landscapes of many countries, enhancing representative democracy. Let's dive deeper to understand how.

Consider the case of Ireland where the STV system is used for House of Representatives or 'Dáil' elections. The system has led to a greater variety of parties being represented in the Dáil, fostering a diverse political landscape. Similarly, in Malta, the use of the STV system has led to a highly proportional representation in parliament. This, in turn, enhances the democratic process by accurately reflecting voters' choices. Australia's variant of STV for Senate elections, known as 'Group Voting Tickets', has given smaller, less-established parties a chance to gain representation. It adds to the democratic mix and allows for broader representation of ideas in political discourse.

Moreover, take a closer look at Scotland. Following the introduction of STV for local council elections in 2007, there was a substantial increase in the representation of smaller parties. This includes the Scottish Green Party and Independents, indicating the system's potential to give voice to a greater variety of political perspectives. It further fosters more competitive elections, as the outcome is not easily predictable based on the simple majority, making every preference count.

Across the world, the STV system has the potential to encourage participation, improve representation, and shape a vibrant and exciting political landscape. It does not simply privilege the majority; instead, it respects and values every vote cast and every voice raised.

## Single Transferable Vote - Key takeaways

• The Single Transferable Vote (STV) is a voting system designed for proportional representation in multi-seat constituencies. It is a preferential voting system where voters rank candidates in order of preference.
• Key elements of the STV are preferential voting, vote quotas, and vote transfer. Voters rank candidates according to preference, and a minimum number of votes (quota) is required for a candidate to secure a seat. Excess votes or votes from lowest-scoring candidates are then redistributed according to voters' second preferences.
• Advantages of the STV are that it ensures minority representation, eliminates tactical voting, and promotes variety among representatives. However, it can also be complex and time-consuming, potentially confusing to voters used to 'one person, one vote' systems, and can lead to partial representation (coalition or minority governments).
• Comparison between STV and Alternative Vote (AV): STV is used in multi-seat constituencies while AV is for single-seat ones. STV more thoroughly transfers excess votes or votes from eliminated candidates, while AV relies only on votes from eliminated candidates. STV can result in more proportional representation as several candidates can win from one constituency, while AV will only result in one representative.
• Several countries employ the STV system, such as Ireland, Australia, and Malta. STV finds application in local elections in Scotland and New Zealand, and is used by various non-governmental organizations due to its focus on proportional representation. It has impacted political landscapes positively by enabling the varied representation of parties and fostering democratic participation.

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What is the process of calculating results in a Single Transferable Vote system?
In a Single Transferable Vote system, voters rank candidates in order of preference. To calculate results, a quota is determined which a candidate must reach to be elected. Votes are initially distributed based on first preferences. Any excess votes for a candidate exceeding the quota are redistributed based on next preferences until all positions are filled.
What is the significance of the ranking system in the Single Transferable Vote method?
The ranking system in the Single Transferable Vote method allows for a more nuanced representation of voter preferences. If a voter's top choice cannot be elected, their vote is transferred to their next preferred candidate, ensuring no vote is wasted and minority views are represented.
How does the Single Transferable Vote method promote proportional representation in politics?
The Single Transferable Vote (STV) method promotes proportional representation by allowing voters to rank candidates in order of preference. This system ensures that the number of seats a party wins in an election is roughly in proportion to the number of votes they receive. It also takes into account voters' secondary choices if their first-choice candidate is eliminated or already has enough votes.
Why is the Single Transferable Vote method considered more democratic compared to other voting systems?
The Single Transferable Vote (STV) method is considered more democratic as it allows a more accurate representation of voters' preferences. It reduces 'wasted' votes, allows for multiple winners, and ensures representation to minority groups, making it more proportional and inclusive.
What are the potential drawbacks or criticisms associated with the Single Transferable Vote system?
Critics of the Single Transferable Vote (STV) system argue it can be complex and confusing for voters. Additionally, it can potentially lead to increased ballot errors and longer vote counts. Some also contend that it can make establishing stable governments more difficult due to the possibility of fractured results.

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