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In this Jan. 4, 1998 photo, Nobel laureate Paul Samuelson listens to remarks during a program in Chicago to mark the 50th year and the 16th edition of his book "Economics." Samuelson, one of the leading economists of the 20th century, died Sunday, Dec. 13, 2009, at his home in Belmont, Mass. He was 94. (KEYSTONE/AP Photo/Daniel Lippitt)