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Luminous efficacy of radiation measures the fraction of electromagnetic power which is useful for lighting. It is obtained by dividing the luminous flux by the radiant flux. [4] Light wavelengths outside the visible spectrum reduce luminous efficacy, because they contribute to the radiant flux, while the luminous flux of such light is zero ...
Since reaching a peak of 1.85 million at the 1950 census, Detroit's population has declined by more than 65 percent. [9] In 2013, Detroit became the largest U.S. city to file for bankruptcy, but successfully exited in 2014. [13]
The world economy or global economy is the economy of all humans in the world, referring to the global economic system, which includes all economic activities conducted both within and between nations, including production, consumption, economic management, work in general, financial transactions and trade of goods and services.
The free white population had the highest standard of living in the world. [ 5 ] [ 6 ] There was very little change in productivity and little in the way of introduction of new goods and services. Under the mercantilist system, Britain restricted the products that could be made in the colonies, and imposed high protective tariff s and other ...