Productivity, Net Factor Income, or Derived Value Methods:
Application: to estimate the economic value of ecosystem products  
                     or services that contribute to the production of    
                     commercially marketed goods

Easiest applications:
¥cases where the ES in question is a perfect substitute for other inputs
¥cases where only producers of final good benefit from changes in quantity or quality of the ES

Data needs: 
¥ costs of production for the final good
¥ supply and demand for the final good
¥ supply and demand for other factors of production