Ecolabels Certification 1 Color 1 Credence goods 1 Eco-labels 1 Environmental policy 1 Environmental protection 1 Information provision 1 Least squares approximations 1 Meats 1 NGOs 1 Quasi-experimental 1 Random utility model 1 Retail stores 1 Sustainable development 1 Sustainable seafood 1 Traffic light 1 Traffic-light labels 1 United States 1 Vertical differentiation 1 environmental economics 1 environmental modeling 1 environmental policy 1 seafood 1 sustainability 1 willingness to pay 1