Data supplements
Supplemental Data File: Economic Surplus Calculations
This paper uses a version of a published framework (Alston et al. 1998) to illustrate changes in economic welfare for grapevine nurseries, consumers, and producers. The model assumes linear supply and demand curves and a vertically parallel supply shift induced by the policy. The base case is the current one for which data is available, with the Grapevine Leafroll associated Virus-3 (GLRaV-3) screening program in place, and the counterfactual alternative case is one without the program. Figure A-1 shows the shift in supply as well as areas representing the corresponding changes in consumer surplus (△CS) and producer surplus (△PS).Files in this Data Supplement: