Abstract: In this paper, I have tried to give a theoretical approach to The economy of developed countries: USA VS JAPAN. The economy in developed countries is sustained by high average incomes per person and the percentage of citizens living in poverty is very low; a powerful and technologically advanced industry; a high level of life, which is reflected in the development of infrastructures and in the quantity and quality of health, educational, cultural services, and so on and so forth. In addition, a good part of the population maintains a high level of consumption.
Keywords: economy; USA; JAPAN; economy grew.
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