Development Theories: Modernization vs Dependency

Development theories are explanations of why some countries are richer than others and how poorer countries can develop; modernization theory argues that countries develop by following the path of today’s rich countries through stages of growth, while dependency theory argues that the poverty of some countries is caused by their unequal position in the global economy. In brief: Walt Rostow’s five stages of growth (1960) are the best-known modernization model. Dependency theorists such as Andre Gunder Frank and the Prebisch-Singer thesis argue that exporting raw materials and importing manufactures locks poorer countries into a weak position. Later approaches include neoliberalism, the developmental state, the capability approach and sustainable development.

Theories of development shape aid, trade and policy choices, so understanding them helps to explain debates about what poor countries should do. This guide explains the main theories, the evidence for and against them, compares them in a table, works through calculations of growth models and trade terms, outlines the history and corrects common mistakes.

What is modernization theory?

Modernization theory, prominent in the 1950s and 1960s, saw development as a process by which “traditional” societies become “modern” through economic growth, industrialization, urbanization, education and the adoption of Western institutions and values. Its best-known version is Rostow’s stages of economic growth (1960), described as a “non-communist manifesto”:

1. Traditional society: agriculture, low productivity, limited technology.
2. Preconditions for take-off: new ideas, early investment in transport and education, the rise of a commercial elite.
3. Take-off: rapid growth in one or a few leading industries, with investment rising to over 10% of national income. Britain’s take-off was often placed in the late 18th century.
4. Drive to maturity: diversification of industry and the spread of technology.
5. Age of high mass consumption: consumer goods, services and welfare states.

Other modernization-era models include Arthur Lewis’s dual-sector model (1954), in which surplus labor moves from low-productivity farming to the industrial sector, and the Harrod-Domar model, in which growth depends on the savings rate and the productivity of capital. Policy implications were to promote investment, aid, technology transfer and industrialization, as in the Marshall Plan. Critics argued that the theory assumed that all countries follow the same path, ignored colonial history and global power and treated traditional culture as an obstacle.

What is dependency theory?

Dependency theory arose in the 1950s and 1960s in Latin America and was developed by economists such as Raúl Prebisch, Hans Singer, Celso Furtado and Andre Gunder Frank. It argues that the global economy is divided into a core of industrial countries and a periphery of countries that export raw materials, and that this relationship benefits the core. Key ideas include:

• The Prebisch-Singer thesis (1950): the prices of primary commodities tend to fall relative to the prices of manufactured goods over the long term, so peripheral countries must export more to buy the same imports, which means a worsening of the terms of trade.
• Frank’s “development of underdevelopment” (1966): underdevelopment is not an original state but the result of the historical relationship with the colonial powers and the world market, which extracts surplus from the periphery.
• Unequal exchange and foreign ownership: profits are sent abroad, local elites ally with foreign capital, and technology remains in the core.
• World-systems theory (Immanuel Wallerstein, 1974): a three-tier structure of core, semi-periphery and periphery within a single capitalist world economy.

The policy implications were to reduce dependence by promoting import-substituting industrialization (making goods locally behind tariff walls), regional cooperation, control of foreign investment and, for radical thinkers, a break with the world market. Latin American countries used these policies from the 1950s to the 1970s, with mixed results: some industrial growth but inefficiency, debt and dependence on imported inputs.

What other approaches exist?

• Neoliberalism (1980s onward): emphasizes free markets, privatization, deregulation, trade liberalization and limited government, as in the “Washington Consensus” (a term coined by John Williamson in 1989) and the structural adjustment programs of the IMF and World Bank. Critics point to social costs and uneven results.
• The developmental state: the experience of Japan, South Korea, Taiwan and later China, where the state guided investment, protected and supported selected industries and pushed exports, while also investing in education and agriculture.
• The capability approach (Amartya Sen): development as the expansion of people’s freedoms and capabilities, as in the Human Development Index.
• Institutions and governance: the role of property rights, rule of law and political institutions, argued by Douglass North and by Daron Acemoglu and James Robinson.
• Post-development and sustainable development: critiques of growth-centered development and the view that development should take account of the environment, equality and local knowledge, as in the Sustainable Development Goals.

How do the theories compare with evidence?

Neither modernization nor dependency theory fits all cases. Some countries have followed a path of industrialization and rapid growth, as modernization theory predicts, with the East Asian economies showing that late developers can catch up, although they did so with strong state involvement, which is not what Rostow described, and in a global economy that offered them export markets. The dependency view captures real problems of commodity dependence, volatile prices and unequal power, but the success of East Asia, which engaged with the world economy, challenged its pessimism about trade, and many countries that isolated themselves did worse. Today, most economists accept a mix: markets and trade matter, but so do institutions, education, infrastructure, industrial policy and the way a country is integrated in global value chains.

The theories compared

Worked example: growth models and terms of trade

The values are hypothetical and illustrate the calculations.

1. Harrod-Domar growth: the growth rate g = s ÷ v, where s is the savings rate and v is the capital-output ratio (the units of capital needed for one unit of output). With s = 20% and v = 4, g = 0.20 ÷ 4 = 5% a year. If s is only 12%, g = 0.12 ÷ 4 = 3%.

2. The savings needed for a target: to reach 6% growth with v = 4, savings must be s = g × v = 0.06 × 4 = 24% of national income. If domestic savings are 15%, the gap of 9% must be filled by foreign aid or investment, which is the “financing gap” idea.

3. Terms of trade: the net barter terms of trade = (export price index ÷ import price index) × 100. If the export prices fall from 100 to 90 and import prices rise from 100 to 110, the index is 90 ÷ 110 × 100 = 81.8, a worsening of 18%.
4. Effect on purchasing power: to buy the same imports, the country must now export 110 ÷ 90 = 1.22 times as much, or 22% more volume. If a country sold 100,000 tonnes of coffee to buy a tractor, it now needs 122,000 tonnes.

5. Take-off investment: in Rostow’s model, investment must rise from about 5% to over 10% of national income. If a country with a GDP of 40 billion invests 5%, it invests 2 billion, and to reach 10% needs 4 billion, an additional 2 billion.
6. Catch-up growth: a country that grows at 7% a year increases its output by 1.07²⁰ = 3.87 times in 20 years. At 3%, it grows 1.03²⁰ = 1.81 times.

How did development thinking evolve?

After the Second World War and decolonization, development became an international project, and President Truman’s 1949 “Point Four” speech spoke of “underdeveloped areas.” Modernization theory dominated in the 1950s and 1960s. Dependency theory arose in Latin America in the 1950s and 1960s, notably through the UN Economic Commission for Latin America under Prebisch, and became influential in the 1970s alongside calls for a “New International Economic Order.” The debt crisis of the 1980s ended import substitution in many countries and led to structural adjustment and neoliberal policies. The East Asian success stories and the 1997 Asian financial crisis, the development of the Human Development Index (1990) and the Millennium and Sustainable Development Goals gave rise to broader views. Today, development thinking considers many factors, including inequality, climate and technology.

Which mistakes are common?

Mistake 1: Treating Rostow’s stages as a fixed timetable

The stages are a simplified model drawn from the history of a few countries. Countries differ in path, timing and the global conditions they face.

Mistake 2: Assuming that dependency theory says that trade is always harmful

It argues that the terms and structure of integration matter. Many dependency thinkers favored selective, planned engagement and not complete isolation.

Mistake 3: Believing that one theory explains all cases

Each captures part of the picture. Contemporary analysis combines market, state, institutional and global factors.

Mistake 4: Mixing up the terms of trade with the trade balance

Terms of trade compare export and import prices. The trade balance is the difference between the values of exports and imports.