Rosenstein-Rodan Model: Key Indivisibilities

The Rosenstein-Rodan model, often called the "Big Push" theory, suggests that developing countries are stuck in a poverty trap. To escape this, a large, simultaneous investment is needed across many sectors. This requires overcoming several indivisibilities, which are characteristics of the production process or market that prevent small-scale operations or investments.

Supply Side Indivisibilities in the Model

A major indivisibility highlighted in the Rosenstein-Rodan model relates to the supply side of the economy. This encompasses several factors:

• Large Capital Requirements: Establishing modern industries requires substantial investment in machinery, technology, and factories. This initial capital outlay is often too large for individual firms or small markets to support.
• Complementarity of Investments: Investments in different sectors are often interdependent. For instance, an investment in manufacturing requires parallel investments in infrastructure (like power and transportation) and potentially other industries that supply inputs or use the manufactured goods. A failure to invest simultaneously across these complementary sectors hinders the success of any single investment.
• Infrastructure Needs: Developing countries often lack the necessary infrastructure. Building this infrastructure (roads, ports, electricity) requires massive upfront investment and benefits many industries, making it a classic example of supply-side indivisibility.

The model argues that without a coordinated "Big Push" addressing these supply-side constraints simultaneously, individual investments are unlikely to succeed due to a lack of necessary inputs, supporting industries, or sufficient demand from a broadly industrialized economy.

Evaluating the Options

• Services and Agriculture: While important for development, these sectors are not typically identified as the primary *indivisibilities* that the "Big Push" model focuses on overcoming for initial industrialization.
• Infrastructure: This is a crucial component of supply-side indivisibility but is arguably a subset of the broader issue of coordinating large-scale investments across the entire supply chain.
• Supply: This option best encapsulates the core challenge emphasized by the model – the need for large, simultaneous investments to build productive capacity and overcome interdependence on the production side, enabling the economy's overall supply capabilities to increase significantly.