CRITERIA FOR MODEL SPECIFICATION OF DEMAND SYSTEMS Four general principles are formulated as criteria for model specification of demand systems. The concepts shed light on systems credibility, validation, strengths, and weaknesses. The principles are used to judge the empirical performance of the S 1 -branch system. Publication Type:Conference Paper/ Presentation Record Identifier:http://ageconsearch.umn.edu/record/279294 Record created 2018-10-26, last modified 2018-10-26