Economics / Timothy Tregarthen, Libby Rittenberg. Tregarthen, Timothy D. 8719 Rittenberg, Libby. 8720 Economics. 525 HB171.5 .T64 2000 330 21 Includes bibliographical references and index. New York : Worth Publishers, 2000. 2000. 2000 Text xxv, 697, [27] p. : http://www.loc.gov/catdir/enhancements/fy1011/99049098-d.html eng