ECO 304 — INTERMEDIATE MACROECONOMICS: Lecture Note

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LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Course code: ECO 304 Course title: Intermediate Macroeconomics ll Course credit load: 2 Units List of Series • Series 1: Theories of Economic Growth • Series 2: Government Policies – Fiscal and Monetary Approaches • Series 3: Unemployment and Inflation – Theories and Problems • Series 4: The International Economy – Trade, Exchange Rates, and Balance of Payments • Series 5: Policy Measures and Macroeconomic Frameworks (Classical, Keynesian, and New Classical Perspectives Suggested Outline Part 1: Classical and Neo-Classical Growth Models • 1.1 The Harrod–Domar (H-D) model • 1.2 Contributions of Nicholas Kaldor • 1.3 Pasinetti’s approach to growth • 1.4 Joan Robinson’s model • 1.5 Solow’s neo-classical growth model Part 2: Marxian and Keynesian Growth Models • 2.1 The Marxian theory of growth • 2.2 The Keynesian growth model Part 3: Endogenous Growth Models • 3.1 Arrow’s learning-by-doing model • 3.2 Romer’s model of technological change • 3.3 Lucas’s human capital model • 3.4 Other contributions to endogenous growth theory Part 4: Comparative Perspectives and Applications • 4.1 Comparing classical, Marxian, Keynesian, and endogenous models • 4.2 Applications of growth theories to modern economies • 4.3 Policy implications of growth models

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Introduction Economic growth has always been at the heart of macroeconomic analysis, since it determines how societies improve living standards, reduce poverty, and expand opportunities over time. Understanding the theories of growth provides learners with a foundation for interpreting how economies evolve, why they differ in performance, and what policies can foster sustained development. This Series will therefore guide you through the major schools of thought that have shaped our understanding of growth, from classical perspectives to modern approaches. The aim of this Series is to equip you with the ability to explain, compare, and critically evaluate the main theories of economic growth, and to apply them in analysing contemporary economic issues. We shall commence this Series by examining the Classical and Neo-Classical growth models, including the Harrod–Domar model, contributions of Kaldor, Pasinetti, Joan Robinson, and Solow’s model. Next, we will explore the Marxian and Keynesian growth models, which provide alternative perspectives on accumulation and demand. Subsequently, we will turn to the Endogenous growth models, focusing on the contributions of Arrow, Romer, Lucas, and others who emphasise technology and human capital. Finally, we will conclude with Comparative perspectives and applications, where we will compare the different models, consider their relevance to modern economies, and discuss their policy implications. Series Learning Outcomes Upon completing this Series, you should be able to: SLO 1.1 define the key features of the Harrod–Domar model and explain its implications for savings, investment, and growth, SLO 1.2 analyse the contributions of Kaldor, Pasinetti, Joan Robinson, and Solow to the development of classical and neo-classical growth models, SLO 1.3 explain the Marxian theory of growth, focusing on capital accumulation, class relations, and long-term dynamics, SLO 1.4 describe the Keynesian growth model, highlighting the role of demand, investment, and government intervention, SLO 1.5 evaluate the main endogenous growth models of Arrow, Romer, and Lucas, and discuss how they emphasise technology, innovation, and human capital, SLO 1.6 compare the assumptions and conclusions of classical, Marxian, Keynesian, and endogenous growth theories, and SLO 1.7 apply growth theories to contemporary economic contexts, identifying their policy implications for modern economies.

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 1.1 Classical And Neo Classical Growth Models 1.1.1 The Harrod–Domar (H-D) model The Harrod–Domar model is one of the earliest formal growth models. It emphasises the role of savings and investment in driving economic growth. According to this model, the rate of growth depends on the savings ratio and the productivity of capital. If savings are too low, growth stagnates, while excessive reliance on capital without efficiency can lead to instability. Fill in the blank: The Harrod–Domar model emphasises the role of __________ and investment in driving growth. [Diagram showing the relationship between savings, investment, and growth in the Harrod–Domar model. Figure 1.1 The Harrod–Domar growth model 1.1.2 Contributions of Nicholas Kaldor Nicholas Kaldor proposed a set of stylised facts about economic growth, such as the constancy of capital output ratios and the stability of income shares. His work highlighted the importance of technological progress and capital accumulation. Kaldor’s contributions provided empirical grounding for growth theory and influenced later models. Fill in the blank: Nicholas Kaldor emphasised the importance of __________ progress and capital accumulation in growth. 1.1.3 Pasinetti’s approach to growth Luigi Pasinetti extended Kaldor’s ideas by focusing on income distribution between workers and capitalists. His model showed how savings behaviour differs across social classes and how

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS this affects long-term growth. Pasinetti’s approach highlights the social dimension of growth, linking economic outcomes to class structures. [Box 1.1 Pasinetti’s focus on income distribution Box explaining how workers and capitalists save differently and its impact on growth. 1.1.4 Joan Robinson’s model Joan Robinson developed a growth model that emphasised the role of capital accumulation and labour productivity. She argued that growth depends on the balance between investment and the availability of labour. Her model also explored the dynamics of profit rates and their influence on investment decisions. Fill in the blank: Joan Robinson’s model emphasised the role of capital accumulation and __________ productivity. 1.1.5 Solow’s neo-classical growth model The Solow model is a cornerstone of modern growth theory. It introduces the concept of a steady-state, where output grows at a constant rate determined by technological progress. Unlike earlier models, Solow’s framework shows that long-term growth cannot rely solely on capital accumulation, but must be driven by innovation and productivity improvements.

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS [Table 1.1 Key features of the Solow growth model Table listing assumptions, mechanisms, and outcomes of the Solow model. Pilot questions 1.1 1. What does the Harrod–Domar model emphasise as drivers of growth? 2. State one of Kaldor’s stylised facts about economic growth. 3. How does Pasinetti’s model link savings behaviour to growth? 4. What two factors are central to Joan Robinson’s growth model? 5. What is the main contribution of Solow’s neo-classical growth model to growth theory? 1.2 Marxian And Keynesian Growth Models 1.2.1 The Marxian theory of growth The Marxian theory of growth is rooted in Karl Marx’s analysis of capitalism. It emphasises the role of capital accumulation, where profits are reinvested to expand production. Marx argued that this process creates contradictions: while capitalists seek to maximise profits, workers face exploitation, leading to class conflict. Over time, these tensions can result in crises and structural changes in the economy. Fill in the blank: The Marxian theory of growth emphasises the role of __________ accumulation in driving economic expansion.

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS [Diagram showing capital accumulation and class relations in Marxian growth theory. Figure 1.2 The Marxian theory of growth 1.2.2 The Keynesian growth model The Keynesian growth model builds on John Maynard Keynes’s ideas about demand and investment. It highlights the importance of aggregate demand, government spending, and investment in sustaining economic growth. Unlike the Marxian view, Keynesian theory sees government intervention as a stabilising force that can prevent recessions and maintain employment. Growth, in this model, depends on balancing savings and investment, with fiscal and monetary policies playing a central role. Fill in the blank: The Keynesian growth model highlights the importance of __________ demand and government spending in sustaining growth.

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS [Table 1.2 Key features of the Keynesian growth model Table listing assumptions, mechanisms, and outcomes of the Keynesian growth model. Pilot questions 1.2 1. What is the central mechanism driving growth in the Marxian theory? 2. How does the Marxian model link capital accumulation to class conflict? 3. What role does aggregate demand play in the Keynesian growth model? 4. Why is government intervention considered essential in Keynesian growth theory? 5. How do savings and investment interact in the Keynesian framework? 1.3 Endogenous Growth Models 1.3.1 Arrow’s learning-by-doing model The learning-by-doing model proposed by Kenneth Arrow highlights how productivity improves as firms gain experience through production. In this framework, knowledge is treated as a by-product of investment and production, meaning that growth can be sustained without diminishing returns to capital. The model shows that continuous innovation and practice can lead to long-term economic expansion. Fill in the blank: Arrow’s learning-by-doing model treats knowledge as a by-product of __________ and production.

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