TutorChase logo
Decorative notebook illustration
IB DP Economics Study Notes

1.1.3 Branches of Economics

Economics, as a discipline, offers a comprehensive lens to view and understand the complexities of how societies manage and allocate their limited resources. To facilitate a structured approach, the subject is categorised into distinct branches. This section will explore three primary branches: Microeconomics, Macroeconomics, and Behavioural Economics.


Microeconomics delves into the intricacies of individual economic entities, focusing on the behaviours and decisions of singular consumers, firms, and specific markets.

Key Features:

  • Individual Decision Making:
    • Analyses the factors influencing consumer choices, such as preferences, budget constraints, and prices. For a deeper understanding, see Consumer Behaviour.
    • Explores concepts like utility maximisation and consumer equilibrium.
  • Firms and Production:
    • Investigates the production decisions of firms, considering factors like technology, input prices, and market conditions. The behaviour of producers in different market conditions is further elaborated here.
    • Delves into the cost structures, including fixed and variable costs, and their impact on production levels.
  • Market Structures:
    • Examines the characteristics and outcomes of various market structures, including perfect competition, monopoly, monopolistic competition, and oligopoly.
    • Analyses how different structures influence pricing, product quality, and consumer welfare.
  • Resource Allocation:
    • Focuses on how resources (land, labour, capital) are distributed among producers.
    • Studies the role of prices in guiding resource allocation in markets.


  • Provides insights into the functioning of individual markets and sectors.
  • Assists policymakers in formulating regulations, price controls, and interventions in specific markets.
IB Economics Tutor Tip: Understanding the interplay between Microeconomics, Macroeconomics, and Behavioural Economics is crucial for grasping how individual choices scale up to influence broader economic phenomena and policy-making.


Macroeconomics offers a bird's-eye view of the economy, concentrating on aggregate indicators and overarching economic phenomena.

Key Features:

  • National Income:
    • Measures the total income earned by a country, including GDP, GNP, and other aggregate metrics. For further insights, explore the page on Gross Domestic Product (GDP).
    • Explores the components of national income, such as consumption, investment, government spending, and net exports.
  • Economic Growth:
    • Studies the factors influencing long-term increases in a country's productive capacity, such as technology, capital accumulation, and human capital development.
    • Analyses the implications of growth for living standards and economic well-being.
  • Inflation and Deflation:
    • Examines the causes and consequences of general price level changes.
    • Investigates the roles of demand-pull and cost-push factors in driving inflation.
  • Unemployment:
    • Delves into the various types of unemployment, including frictional, structural, and cyclical.
    • Analyses the societal and economic impacts of high unemployment rates.
  • Monetary and Fiscal Policy:
    • Explores how central banks use monetary tools, like interest rates and open market operations, to influence economic activity. The Types of Monetary Policy provides a comprehensive overview.
    • Studies the impact of government spending and taxation policies on aggregate demand and supply.


  • Provides a framework to assess the overall health, stability, and growth prospects of an economy.
  • Guides national economic policies, including fiscal stimulus packages, monetary interventions, and structural reforms.
An image comparing microeconomics and macroeconomics

Image courtesy of economicshelp

Behavioural Economics

Blending psychology with traditional economic principles, Behavioural Economics seeks to understand the often-irrational patterns in human economic decision-making.

An image of behavioral economics

Image courtesy of streetfins

Key Features:

  • Bounded Rationality:
    • Challenges the traditional economic assumption of complete rationality.
    • Suggests that cognitive limitations often lead individuals to make sub-optimal decisions.
  • Heuristics and Biases:
    • Explores the mental shortcuts individuals use in decision-making processes.
    • Studies common biases, such as overconfidence, loss aversion, and confirmation bias, that skew economic decisions. The concept of Externalities illustrates how individual decisions can have unintended consequences on others.
  • Social Preferences:
    • Analyses how societal norms, fairness considerations, and altruistic tendencies influence individual choices.
    • Investigates phenomena like reciprocity, social norms, and reputation considerations in economic contexts.
  • Time Inconsistency:
    • Probes into the inconsistencies in decisions made over different time horizons.
    • Explores concepts like present bias, where individuals disproportionately value immediate rewards over future benefits.
IB Tutor Advice: For exams, practice applying theories from each branch to current economic events. This demonstrates your ability to analyse real-world scenarios using the concepts you've learned.


  • Offers a nuanced understanding of economic decisions, moving beyond the simplistic rational agent model.
  • Informs the design of policies, products, and interventions that align with real-world human behaviours and biases.

Diving deep into these branches equips students with a holistic understanding of economics. From the granular details of individual markets to the expansive vistas of national economies, and the intricate web of human behaviours, these branches collectively illuminate the multifaceted world of economic interactions.


Time inconsistency in behavioural economics refers to the tendency of individuals to change their preferences over time, leading to decisions that might be inconsistent with their earlier preferences or long-term goals. A classic example is procrastination or the preference for immediate gratification over long-term benefits. This concept is significant because it highlights the challenges individuals face in making decisions that align with their long-term well-being. Recognising time inconsistency can help in designing policies, financial products, and interventions that nudge individuals towards decisions that are in line with their long-term interests, such as saving for retirement or making healthier lifestyle choices.

Macroeconomic indicators like inflation and unemployment often have intricate relationships. For instance, the Phillips Curve, a concept in macroeconomics, originally posited an inverse relationship between inflation and unemployment. It suggested that when unemployment is low, inflation tends to be high and vice versa. This relationship was based on the idea that when more people are employed, demand for goods and services increases, potentially leading to higher prices (inflation). However, in recent decades, many economies have experienced periods of low inflation alongside low unemployment, challenging the traditional Phillips Curve relationship. It's essential to understand these interrelations to design effective monetary and fiscal policies.

Governments use macroeconomic insights to design policies that aim to achieve economic stability, growth, and welfare. For instance, if a country is experiencing high unemployment, the government might introduce fiscal stimulus measures, like increased public spending or tax cuts, to boost demand and create jobs. Similarly, insights into inflation can guide central banks in setting interest rates. If inflation is too high, central banks might increase interest rates to curb excessive spending and borrowing. Macroeconomic theories and models provide a framework for understanding the broader economic landscape, helping policymakers anticipate potential challenges and design interventions to steer the economy towards desired outcomes.

The study of different market structures in microeconomics is crucial because each structure has distinct characteristics that influence pricing, product quality, consumer welfare, and the overall efficiency of the market. For instance, in a perfectly competitive market, there are many sellers offering identical products, leading to competitive pricing and maximum consumer welfare. In contrast, a monopoly, where a single firm dominates the market, might result in higher prices and reduced consumer choice. By understanding these structures, policymakers can design appropriate regulations and interventions to promote competition, prevent monopolistic practices, and ensure that markets operate efficiently for the benefit of consumers and producers alike.

Microeconomics assumes that consumers are rational decision-makers who aim to maximise their utility or satisfaction. It believes that consumers make choices based on their preferences, budget constraints, and the prices of goods and services. On the other hand, Behavioural Economics recognises that consumers often deviate from this rational model due to psychological factors. It introduces concepts like heuristics, biases, and social preferences to explain why consumers might make seemingly irrational decisions. While microeconomics provides a foundational framework for understanding consumer choices, behavioural economics offers a more nuanced and realistic perspective by incorporating insights from psychology.

Practice Questions

Distinguish between Microeconomics and Macroeconomics, providing two key features of each.

Microeconomics focuses on individual economic units, such as consumers, firms, and specific markets. Two key features of microeconomics are the study of individual decision-making, where factors like preferences and budget constraints influence consumer choices, and the examination of different market structures, like monopolies and perfect competition, which influence pricing and product quality. On the other hand, Macroeconomics deals with the economy as a whole, concentrating on aggregate indicators. Two primary features of macroeconomics are the measurement of national income, which includes metrics like GDP and GNP, and the study of economic growth, which analyses long-term increases in a country's productive capacity and its implications for living standards.

Explain one key feature of Behavioural Economics and discuss its significance in understanding economic decisions.

Behavioural Economics introduces the concept of "bounded rationality", which challenges the traditional economic assumption that individuals always make rational decisions. Bounded rationality suggests that due to cognitive limitations, individuals often make decisions that might seem irrational or sub-optimal. This feature is significant in understanding economic decisions because it offers a more realistic model of human behaviour. Recognising that individuals might not always act in their best interest, due to biases or misjudgements, can help policymakers design more effective policies and interventions. It also provides businesses with insights into consumer behaviour, allowing them to tailor their products and marketing strategies more effectively.

Dave avatar
Written by: Dave
Cambridge University - BA Hons Economics

Dave is a Cambridge Economics graduate with over 8 years of tutoring expertise in Economics & Business Studies. He crafts resources for A-Level, IB, & GCSE and excels at enhancing students' understanding & confidence in these subjects.

Hire a tutor

Please fill out the form and we'll find a tutor for you.

1/2 About yourself
Still have questions?
Let's get in touch.