凯因斯介绍了凯恩斯经济学，这是经济中的消费经济理论，这是与总需求，并对产出和通货膨胀的影响。
Keynes introduced Keynesian economics, which is an economic theory of spending in the economy, which is related to aggregate demand, and its effect on output and inflation.
基于经济学理论和方法对煤炭市场总供给和总需求进行了分析，奠定了煤炭产业经济学的基本概念框架。
Total supply of, and total demand for coal in the market is analyzed based on economics theory and methodology. A basic conceptual framework of coal industry economics has been established.
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