The legislature

Intuition [Beginner]

A legislature is the branch of government responsible for making, changing, and repealing laws. It is also the branch that most directly represents the people -- in most countries, legislators are elected by voters from specific geographic areas.

Legislatures do three main things:

1. Make laws: debate, amend, and vote on proposed legislation.
2. Oversee the executive: question ministers, investigate government actions, approve budgets.
3. Represent citizens: give people a voice in government through their elected representatives.

Most countries divide their legislature into two chambers (bicameral), though some have just one (unicameral). The logic of two chambers is that they serve different purposes or represent different constituencies -- for example, one chamber represents the people by population and the other represents states or regions equally.

Visual [Beginner]

How major legislatures are structured

Country	Name	Chambers	Lower house	Upper house	How lower house is elected	How upper house is chosen
US	Congress	Bicameral	House of Representatives (435)	Senate (100)	Single-member districts, FPTP	2 per state, directly elected
UK	Parliament	Bicameral	House of Commons (650)	House of Lords (~780)	Single-member districts, FPTP	Appointed, hereditary, and bishops
Germany	Parliament	Bicameral	Bundestag (733)	Bundesrat (69)	Mixed-member proportional	State government delegations
India	Parliament	Bicameral	Lok Sabha (543)	Rajya Sabha (245)	Single-member districts, FPTP	Indirect election by state legislatures + presidential appointment
France	Parliament	Bicameral	National Assembly (577)	Senate (348)	Two-round system	Indirect election by elected officials
Japan	Diet	Bicameral	House of Representatives (465)	House of Councillors (248)	Mixed system	Single non-transferable vote + PR
Sweden	Riksdag	Unicameral	Riksdag (349)	--	Proportional representation	--
China	NPC	Unicameral	National People's Congress (2,977)	--	Indirect election (CCP-approved candidates)	--

What legislatures do

Function	Description	Example
Lawmaking	Draft, debate, amend, pass legislation	US Congress passing the Affordable Care Act
Budgetary authority	Approve government spending and taxation	UK Parliament's annual budget process
Executive oversight	Question ministers, investigate, hold hearings	German Bundestag investigating government surveillance
Representation	Advocate for constituents' interests	Indian MPs raising constituency concerns in Lok Sabha
Constituency service	Help individual citizens with government problems	US congressional casework
Leadership selection	Choose or confirm the head of government	UK Commons selecting the prime minister

Worked example [Beginner]

Consider how the US Congress and the German Bundestag differ in how their members are chosen and what this means for representation:

US House of Representatives (435 members): Each state is divided into single-member districts. Voters in each district choose one representative using first-past-the-post voting (whoever gets the most votes wins, even if it is not a majority). This tends to produce two dominant parties because smaller parties struggle to win any districts. A party could win 49% of the vote nationwide but get far fewer than 49% of the seats if its votes are spread across losing districts.

German Bundestag (nominally 598, often larger): Each voter has two votes. The first vote elects a local representative from their district (like the US). The second vote is for a party. Seats are allocated proportionally based on the second vote, with additional seats added to ensure the overall composition matches the party vote share. A party that wins 15% of the second vote gets roughly 15% of the seats. This produces a multiparty system where coalition government is the norm.

The result: the US House tends to produce single-party majorities and adversarial politics. The Bundestag tends to produce coalition governments and negotiated compromise. Neither is inherently better; they reflect different design choices with different trade-offs.

Check your understanding [Beginner]

Formal definition [Intermediate+]

A legislature is the collective body (or bodies) within a political system that has the primary authority to enact, amend, and repeal laws; approve budgets and taxation; and exercise oversight of the executive branch. Legislatures vary along several key dimensions:

Bicameral vs. unicameral:

• Bicameral: two chambers, typically with different composition methods and sometimes different powers. Rationale: additional scrutiny of legislation, representation of different constituencies (people vs. states/regions), prevention of hasty decisions. Approximately 80 sovereign states are bicameral.
• Unicameral: one chamber. Rationale: efficiency, simplicity, avoidance of gridlock between chambers. Examples: Sweden, Denmark, New Zealand, Finland, China.

Advantage	Bicameral	Unicameral
Representation	Can represent different constituencies	Simpler, more direct representation
Deliberation	Double scrutiny of legislation	Faster decision-making
Checks	Second chamber limits first chamber's power	Avoids institutional gridlock
Cost	More expensive to run	Less expensive

Electoral systems and their effects:

System	How it works	Typical effect	Examples
First-past-the-post (FPTP)	Highest vote-getter in each district wins	Two-party dominance	US, UK, India
Proportional representation (PR)	Seats allocated by party vote share	Multiparty systems	Germany, Netherlands, South Africa
Mixed-member proportional (MMP)	District seats + party-list seats to achieve proportionality	Multiparty but with local reps	Germany, New Zealand
Single transferable vote (STV)	Voters rank candidates; surplus votes transfer	Proportional, voter choice	Ireland, Australian Senate
Two-round system	Top two candidates face runoff if no majority	Broader majority support	France

Duverger's law (1954): FPTP tends to produce two-party systems; PR tends to produce multiparty systems. This is not a strict law but a robust empirical regularity: FPTP penalizes small parties because votes for them are "wasted" (they do not translate into seats), so voters and politicians gravitate toward two broad coalitions. PR rewards even small parties with seats, encouraging party proliferation.

Key concepts [Intermediate+]

Legislative committees: Most legislative work happens not on the floor of the chamber but in small, specialized committees. Committees review proposed laws in detail, hold hearings with experts and stakeholders, and recommend amendments. Committee systems vary:

• US Congress: powerful, specialized standing committees with dedicated staff. Committee chairs have significant agenda-setting power. The committee system is often called Congress's "legislative workhorse."
• UK Parliament: departmental select committees shadow each government department and conduct inquiries, but legislation is typically considered by the whole House or ad hoc committees.
• German Bundestag: permanent committees mirror government ministries, with membership proportional to party strength in the Bundestag.

Party discipline: The degree to which legislators vote according to their party's position rather than their individual judgment.

System	Typical discipline	Effect
UK	Very high (whips enforce)	Government reliably passes its agenda
US Congress	Moderate to low	Cross-party voting is common; party leadership cannot guarantee votes
Germany	High (Fraktionsdisziplin)	Coalition agreements structure voting
India	Generally high, but rebellions occur	Government can fall if enough MPs defect

Legislative-executive relations differ fundamentally between presidential and parliamentary systems:

• In parliamentary systems, the executive (prime minister and cabinet) is drawn from the legislature and depends on its confidence. This means the executive usually gets its legislative agenda passed, because defeating the government on a major vote can trigger a new election.
• In presidential systems, the executive and legislature are separately elected and may be controlled by different parties. Neither can dismiss the other (except through impeachment). This creates the possibility of divided government and gridlock.

Exercises

Exercise 1. Germany uses mixed-member proportional (MMP) voting. A party wins 10% of the party vote (second vote) but wins more direct district seats (first vote) than 10% would entitle them to. What happens?

Reveal

The party keeps its district seats and receives additional "overhang seats" (Uberhangmandate) to ensure the overall Bundestag composition reflects the party vote share while all directly elected members keep their seats. Furthermore, other parties receive "balance seats" (Ausgleichsmandate) to maintain overall proportionality. This can make the Bundestag larger than its nominal size (currently 733 instead of the nominal 598). This system ensures both proportional representation and local constituency representation.

Exercise 2. Compare the legislative oversight function in the US Congress and the UK House of Commons. Which is more effective and why?

Reveal

This depends on what is being overseen and how "effective" is defined. US Congressional committees have stronger investigative powers: they can issue subpoenas, hold extensive hearings, and have larger professional staffs. The UK's select committees have grown in power since 2010 (when chairs and members began being elected by the House rather than appointed by party leaders), but they still lack the resources and subpoena power of their US counterparts. However, the UK has question periods where ministers must regularly appear before the Commons, providing more routine public scrutiny. The US system has stronger tools but they are often used for partisan point-scoring rather than genuine oversight; the UK system has weaker tools but a culture of ministerial accountability to Parliament.

Political theory [Master]

The puzzle of legislative representation. What does it mean for a legislature to "represent" the people? Hanna Pitkin (1967) identified four dimensions of representation:

1. Formalistic: representation through authorized institutions (elections create a legal mandate).
2. Descriptive: the legislature should mirror the demographics of the population (women, minorities, occupations).
3. Symbolic: representatives embody the community and generate public trust.
4. Substantive: representatives act in the interests of those they represent (advocating for policies that benefit constituents).

These dimensions can conflict. A legislature that is descriptively representative may not be substantively representative (a wealthy legislator from a poor district may share demographics but not interests). A legislator may face a conflict between acting as a delegate (following constituents' preferences) or a trustee (using their own judgment about what is best, per Burke's 1774 speech to the electors of Bristol).

Legislative organization and collective action. Legislatures are large bodies that must make collective decisions. The organizational challenge is substantial. Weingast and Marshall (1988) modeled legislative committees as self-enforcing exchange mechanisms: legislators trade support across issues (logrolling) because individual bills affect different constituencies differently. Committee assignments allow legislators to develop expertise and claim jurisdiction over policy areas important to their constituents.

The decline of legislatures thesis. Some scholars argue that legislatures have been declining in power relative to the executive. Reasons include:

• Growth of the administrative state (executive agencies make most rules).
• Party leaders' control over the legislative agenda (particularly in parliamentary systems).
• Media-driven politics that focuses on executive leaders.
• International obligations that constrain domestic legislative options (EU regulations, trade agreements, IMF conditions).

However, this "decline" narrative is contested. In some respects, legislatures have gained power: the US Congress's War Powers Resolution (1973), the UK's select committee reforms (2010), and the European Parliament's expanding powers under successive EU treaties all represent legislative strengthening.

Comparative legislative studies. The field has moved beyond describing formal powers to analyzing how legislatures actually function:

• Roll-call analysis: studying voting patterns to measure party cohesion, dimensionality of conflict, and legislator ideology (Poole and Rosenthal's NOMINATE scores for the US Congress).
• Legislative productivity: measuring how many bills are passed, how significant they are, and what factors affect legislative output (Mayhew's Divided We Govern, 1991).
• Women and minorities in legislatures: studying the causes and consequences of descriptive representation. Research suggests that women legislators tend to advocate more for social welfare policies, and that minority representation can affect policy outcomes for minority communities (Mansbridge, 1999).

Historical context [Master]

Early legislative bodies. The Icelandic Althing (930 CE) is one of the oldest parliamentary institutions. England's Magna Carta (1215) established the principle that the king could not levy taxes without the "common counsel" of the realm, leading to the development of Parliament. The Iroquois Confederacy's Grand Council and the medieval guild-based assemblies of Italian city-states were parallel traditions.

The rise of representative legislatures. The English Civil War (1642-1651) established Parliament's supremacy over the monarchy. The American Revolution created legislatures without a monarch. The French Revolution brought legislative power to the continent. Through the 19th century, legislatures became the standard institution of governance in Europe and its settler colonies, though their power and representativeness varied enormously.

The 20th century expansion. After World War II, virtually every new state created a legislature, though their actual power ranged from robust (India's Parliament) to decorative (Soviet Supreme Soviet). The third wave of democratization (1974-1990s) created or revitalized legislatures across Southern Europe, Latin America, Eastern Europe, and parts of Africa and Asia. Legislative design became a focus of constitutional engineering, with debates over electoral systems, bicameralism, and committee structures.

Recent trends. Contemporary legislatures face challenges from executive power expansion, populist movements that emphasize direct appeals over legislative mediation, digital communication that allows leaders to communicate with citizens directly, and international institutions that set policies legislatures must implement. At the same time, some legislatures are experimenting with new forms of engagement: participatory budgeting, digital petition systems, and citizen assemblies.

Bibliography [Master]

• Burke, Edmund. 1774. "Speech to the Electors of Bristol."
• Duverger, Maurice. 1954. Political Parties. Wiley.
• Lijphart, Arend. 1999. Patterns of Democracy. Yale University Press.
• Mansbridge, Jane. 1999. "Should Blacks Represent Blacks and Women Represent Women?" Journal of Politics 61(3): 628-657.
• Mayhew, David. 1991. Divided We Govern. Yale University Press.
• Pitkin, Hanna. 1967. The Concept of Representation. University of California Press.
• Poole, Keith, and Howard Rosenthal. 1997. Congress: A Political-Economic History of Roll Call Voting. Oxford University Press.
• Weingast, Barry, and William Marshall. 1988. "The Industrial Organization of Congress." Journal of Political Economy 96(1): 132-163.