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THE JOURNAL OF ECONOMIC SCIENCES: THEORY AND PRACTICE, V.72, # 2, 2015, pp. 71-84
E.E.Gasimzade: Influence of oil prices on innovation in renewable energy sector
And looking at historical graphs will give visual understanding, but, one thing
should be noted that, indicators or the same year should not be compared, as we will
use lag. The graphs are for informative purposes.
Graph 1. Prepared by the author based on information retrieved from the website of
Illinois Oil and Gas Association
Graph 2. Prepared by the author based on information retrieved from database for
patents of European Patent Office (EPO)
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