One has to rely on such indirect indicators of national power such as GNP or GDP since there still is no agreed single measure of power, particularly since the capabilities that constitute power are non-additive.

Question

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There is no universally agreed-upon single measure of a nation's power because the components that constitute power, such as military capability, economic strength, technological advancement, and diplomatic influence, are complex and cannot be simply added together. Indicators like Gross National Product (GNP) or Gross Domestic Product (GDP) are often used as indirect measures to gauge a country's economic power, which is a significant aspect of its overall power.

One Has to Rely on Such Indirect Indicators of National