Looking at the financial situation of think tanks, different funding patterns can be found. While financial contributions from foundations play an important role especially for conservative think tanks, also contributions from governments are made to certain institutions. Yet one of the most important funding sources are corporate donors and individual contributors. Although the extent to which - in most cases conservative - think tanks rely on corporate funding varies, from the US$ 158 million spent by the top 20 conservative think tanks, more than half of it was contributed by corporations or businessmen.
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American petroleum corporation that was founded in 1889 by the Standard Oil trust to direct the refining and marketing of oil in the Midwestern states. By the late 20th century, American operations still accounted for more than half of Amoco's total assets, though the company has been active in some 40 other countries in the areas of production, refining, and marketing. In addition to refining crude oil, Amoco is one of the largest producers of natural gas in the North American continent.