Solow Growth Model

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The Solow Growth Model, pioneered by Robert Solow near half a century ago, explains many of the fundamental questions regarding the process of capital accumulation occurs and the reason in growth from increased labour input or productivity. In regard to the hypothesis in question (developing countries displaying significant decline in population growth are wealthier now as compared to similar-ranking countries where population growth is still high), it would be pertinent to emphasize how population growth affects the Solow model, as illustrated below. FIGURE 1. Increase in Population Growth Rate and its Effect According to Figure 1, increasing growth rates in the population (from n1 to n2) causes the depreciation and capital dilution line to move in an upwards direction from (δ + n1)kt to (δ + n2)kt. Investment is less than depreciation and capital dilution at point k1* but subsequent decline in capital-labour ratio moves it to point k2*. In other words, there are more workers within an economy when growth in population occurs yet given that the capital input remains the same, there would be a reduction in output as each worker would have less capital to work with (Mishkin, 2012). This theory implies that continuous high growth in population not proportionate to growth of capital would eventually lower the standards of living of an individual. Evidence of this concept was investigated by plotting the change in growth rates of twenty developing countries with high population growth in the 1960s and 2000s along with twenty with lower population growth in the same time period against the real [constant] gross domestic product (GDP) per capita adjusted for purchasing power parity (PPP). The growth rates of the countries were derived from computing the differences of population (United Nations, 2011) between the specific years of 1960 and 2000, chosen for the

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