Template-Type: ReDIF-Article 1.0 Author-Name: Urquiola S., Miguel (Urquiola Soux) Author-Name: Rolf Luders Schwarzenberg Title: Comments Journal: Economía Pages: 123-127 Volume: 4 Issue: 1 Year: 2003 DOI: 10.1353/eco.2004.0010 Handle: RePEc:aoo:51960