Then , the author explains the regularity with the contribution theory .

并用贡献理论解释了这些规律。

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The Geopark's outstanding historical contribution, both in terms of the development of geological and archaeological sciences is astounding: from the Huttonian Theory, to the naming of the Devonian Period by Sedgwick and Murchison, and even Pengelly's discoveries informing worldwide public opinion as to the antiquity of man.

UNESCO: Global Geoparks

The economic contribution of his essay is that it represents the thesis advanced by German economist Georg Friedrich Knapp in The State Theory of Money (1924), an expose advocating the Chartalist approach to monetary theory claiming that money must have no intrinsic value and strictly be used as tokens issued by the government, or fiat money.

FORBES: Bitcoin Obliterates 'The State Theory Of Money'