TY - BOOK AU - Lipsey,Richard G. AU - Forrest, David, AU - Olsen, Wendy, TI - Workbook: For the seventh edition of an introduction to positive economics, richard g. lipsey, david forrest and wendy olsen SN - 0-297-79558-9 AV - HB171 L72532 PY - 1989/// CY - London PB - Weidenfeld & Nicolson KW - Economía ER -