the defination of economic growth麻烦给英文的定义

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Increase in a country's productive capacity,as measured by paring gross national product (GNP) in an year with the GNP in the previous year.Increase in the capital stock,advances in technology,and improvement in the quality and level of literacy are considered to be the principal causes of economic growth.In recent years,the idea of 'sustainable development' has brought in additional factors such as environmentally sound processes that must be taken into account in growing an economy.
======以下答案可供参考======
供参考答案1:
steady growth in the productive capacity of the economy (and so a growth of national ine)
供参考答案2:
经济增长的定义