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Soft Engine for Economic Growth in a Long-Time: The Economic
Development Power, Conversion and Conservation for Economic Energy
The author make a comprehensive empirical analysis on all results in the paper by means of the U.S. GDP data from 1940 to 2003. The conclusions make clear that the economic development power, namely economic development energy, is the engine for the economic growth.
Link
http://econwpa.wustl.edu:80/eps/mac/papers/0411/0411009.pdf