Media type: E-Article Title: Testing the Adding Up Condition in Demand Systems Contributor: Paris, Quirino; Caracciolo, Francesco imprint: Elsevier BV, 2014 Published in: SSRN Electronic Journal Language: English DOI: 10.2139/ssrn.2443516 ISSN: 1556-5068 Keywords: Pharmacology (medical) Origination: Footnote: