It is neither possible nor necessary to document the source of every statement made in this book. However, there are some key facts which some readers may want to check out or to explore further. Rather than clutter the text with footnotes, in a book intended for the general public, the citations are listed here in an informal way that should nevertheless make it possible to find the original sources.
The article about middle-class Americans began on the front page of Section 3 of the New York Times of August 1, 1999 and was written by Louis Uchitelle. The statement that Marxist economist Oskar Lange did not differ fundamentally from Milton Friedman on certain basic propositions and procedures can be verified by reading Oskar Lange, "The Scope and Method of Economics", in the Review of Economic Studies ( 1945-1946), pages 19-32, and comparing that with Milton Friedman essay "The Methodology of Positive Economics" in his book Essays in Positive Economics.
The quoted statistics and analysis about the Soviet economy are from a book titled The Turning Point: Revitalizing the Soviet Economy by two Soviet economists, Nikolai Shmelev and Vladimir Popov, especially pages, 128, 130-131, 141. The quote from Friedrich Engels is from his preface to the first German edition of The Poverty of Philosophy by Karl Marx , where Marx himself makes similar comments in the text, though not in as lucid language as that used by Engels. Information on Ghana and the Ivory Coast is from a book by W. L. Alpine and James Picket, Agriculture, Liberalisation and Economic Growth in Ghana and Côte D'Ivoire:1968-1990, published in Paris in 1996 by the Organisation for Economic Co-Operation and Development. The sales of beef suspected of "mad cow disease" was reported in the Financial Times of March 30, 1996. The relationship between housing prices and population changes in upstate New York is discussed was described on page 70 of an article titled "Down-and-Out Upstate", by Jerry Zremski in the Autumn 1999
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Publication information: Book title: Basic Economics:A Citizen's Guide to the Economy. Contributors: Thomas Sowell - Author. Publisher: Basic Books. Place of publication: New York. Publication year: 2000. Page number: 347.