JEL-codes:E (search for similar items in EconPapers) New Economics Papers: this item is included in nep-cdm, nep-evo, nep-pbe, nep-pke, nep-pol and nep-pub Date: 1998-02-10 Note: Type of Document - Acrobat PDF; prepared on IBM PC ; to print on PostScript; pages: 22; figures: included View list of references