Fakta:
Schröck (2012) “The Organic Milk Market in Germany Is Maturing: A Demand System Analysis of Organic and Conventional Fresh Milk Segmented by Consumer Groups“http://onlinelibrary.wiley.com/doi/10.1002/agr.21298/abstract
Kasteridis och Yen (2012) “U.S. demand for organic and conventional vegetables: a Bayesian censored system approach