Until 1930 most of the economic analysis focuses on industries and companies. When the Great Depression in the 1930s, and with the development of the concept of national income and product statistics, macro-economic field began to grow. At that time, the ideas came mainly from John Maynard Keynes, who uses the concept of aggregate demand to explain fluctuations between production and unemployment rates, very influential in the development of this field. Keynesianism is based on his ideas.
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