Someone has models for GAMS for Water Pricing Policies?
I´m working with two cases in Ecuador, but there is not possible to apply market of water. So the application of water pricing policies go for modernization of the agriculture.
I do not have GAMS model but I have written something about water pricing; see Water: Spatial Network Pricing (45th Congress of the European Regional Science Association) on my page in RG.
I suggested that the price along channel should be heterogeneous and account for water evaporation. In reality, most countries even with regional water scarcity (like Spain) do not have water pricing. Instead they regulate water supply to farmers so that hey can irrigate only a certain fraction of their land.