Rosenstein-Rodan's 'Big Push' theory emphasizes that development requires a massive, coordinated investment across multiple sectors. He identified infrastructure (such as power, transport, and communication) as having major indivisibility, meaning it cannot be provided in small, incremental steps. Because infrastructure is a prerequisite for other industries to function efficiently, it must be developed on a large scale to trigger a self-sustaining growth process.

The supply-side vicious circle focuses on the inability to accumulate capital. It suggests that a country is poor because its low income prevents individuals from saving, which in turn limits the funds available for investment. Without investment, productivity remains low, keeping income levels stagnant. Thus, the country is trapped in a cycle where its current poverty is the direct cause of its inability to grow in the future.

The Lewis model, developed by W. Arthur Lewis, describes the development process in a dual-economy framework. It posits that a developing economy consists of a traditional, subsistence agricultural sector with surplus labor and a modern, industrial capitalist sector. The model explains how labor shifts from the low-productivity agricultural sector to the high-productivity industrial sector, fueling economic growth through capital accumulation and reinvestment of profits.

Economic development is a multidimensional process that goes beyond simple economic growth. While growth focuses on the increase in total output, development encompasses qualitative improvements in the standard of living, changes in the economic structure, and a more equitable distribution of income. It involves structural transformations that enhance the overall welfare and capabilities of a nation's population over time.

Dualistic economy models describe the coexistence of a modern, capital-intensive industrial sector alongside a traditional, labor-intensive agricultural sector. This structural imbalance is a hallmark of many developing nations, where the two sectors operate with different technologies, productivity levels, and social organizations, often leading to significant income disparities and developmental challenges.

Taiwan and South Korea are frequently cited as the 'Asian Tigers' due to their extraordinary economic transformation. Since the 1960s, both nations implemented export-oriented industrialization strategies, invested heavily in human capital, and maintained stable macroeconomic environments, allowing them to sustain high real per capita GDP growth rates that significantly outperformed most other developing nations during the same period.

Emerging markets refer to the economies of developing nations that are currently transitioning toward becoming more advanced. These markets are characterized by rapid industrialization, increasing integration with global trade, and growing financial market sophistication.

Economic growth is fundamentally driven by the expansion of labor inputs, often represented by population growth, and improvements in total factor productivity, which is largely captured by technical progress. These two factors allow an economy to produce more output over time.

Balanced growth theory, often associated with economists like Ragnar Nurkse, suggests that developing economies should invest in various sectors simultaneously. This approach aims to overcome the limitations of small domestic markets by ensuring that the expansion of one industry creates demand for the products of others, thereby creating a self-sustaining cycle of growth and development across the entire economy.

Economic growth refers specifically to an increase in real GDP or output. Economic development is a broader concept that encompasses economic growth alongside qualitative improvements in the standard of living, such as social change, better healthcare, education, and reduced inequality, reflecting a structural transformation of the economy.