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Singer-Prebisch thesis : ウィキペディア英語版
Prebisch–Singer hypothesis
In economics, the Prebisch–Singer hypothesis (also called the Prebisch–Singer thesis) argues that the price of primary commodities declines relative to the price of manufactured goods over the long term, which causes the terms of trade of primary-product-based economies to deteriorate. , recent statistical studies have given moderate support for the idea.〔
〕〔
〕 The idea was initially developed by Hans Singer in 1948–49 and expanded by Raúl Prebisch shortly thereafter; since that time, it has served as a major pillar of dependency theory and policies such as import substitution industrialization (ISI).
==Theory==
A common explanation for this supposed phenomenon is that manufactured goods have a greater income elasticity of demand than primary products, especially food. Therefore, as incomes rise, the demand for manufactured goods increases more rapidly than demand for primary products. In addition, primary products have a low price elasticity of demand, so a decline in their prices tends to reduce revenue rather than increase it.
This theory implies that the very structure of the global market is responsible for the persistent inequality within the world system. This provides an interesting twist on Wallerstein's neo-Marxist interpretation of the international order which faults differences in power relations between 'core' and 'periphery' states as the chief cause for economic and political inequality (However, the Singer–Prebisch thesis also works with different bargaining positions of labour in developed and developing countries). As a result, the hypothesis enjoyed a high degree of popularity in the 1960s and 1970s with neo-Marxist developmental economists and even provided a justification for an expansion of the role of the commodity futures exchange as a tool for development.
Singer and Prebisch noticed a similar statistical pattern in long-run historical data on relative prices, but such regularity is consistent with a number of different explanations and policy stances. Later in his career, Prebisch argued that, due to the declining terms of trade primary producers face, developing countries should strive to diversify their economies and lessen dependence on primary commodity exports by developing their manufacturing industry.
The hypothesis has lost some of its relevance in the last 30 years, as exports of simple manufactures have overtaken exports of primary commodities in most developing countries outside of Africa. For this reason, much of the recent research focuses less on the relative prices of primary products and manufactured goods, and more on the relationship between the prices of simple manufactures produced by developing countries and of complex manufactures produced by advanced economies.
In 1998, Singer argued that the thesis he pioneered has joined the mainstream:

One indication of this is that the PST is now incorporated, both implicitly and explicitly, in the advice given by the Bretton Woods Institutions to developing countries. They are warned to be prudent even when export prices are temporarily favourable and to guard against currency overvaluation and Dutch Disease, with all the unfavourable impact on the rest of the economy and all the dangers of macroeconomic instability which a sudden boom in a major export sector could imply. They are warned to remember that the outlook for commodity prices is not favourable and that windfalls will tend to be temporary, with the subsequent relapse likely to be greater than the temporary windfall. This is exactly the warning which the PST would give.〔Singer, Hans (1998) The South Letter (30) "(The Terms of Trade Fifty Years Later - Convergence and Divergence )"〕


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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