Contingent valuation Willingness to pay 3 Contingent valuations 2 contingent valuation 2 Agricultural machinery 1 Agriculture 1 Animalia 1 Characteristics 1 Clustering 1 Eco-label 1 Ecosystem services 1 Ecosystems 1 Employment 1 Farm mechanization 1 Forest Management 1 Forest preservation 1 Forest sites 1 Forest valuations 1 Forestry 1 Heterogeneous demand 1 Management IS 1 Mechanization 1 Mini-tillers 1 Nepal 1 Organic Product 1 Premium price 1 Preservation 1 Puerto Rico 1 Purchasing 1 Services 1