1. Aggregation of individual benefits Arianne de Blaeij and Martijn van der Heide

2. Research questions Which characteristics are relevant to aggregate individual WTP for landscape improvements, and how? Which characteristics are the most important for aggregation?

3. Proposal Ex-post evaluation existing CBA’s Meta-analysis Rule of thumb

4. Ex-post evaluation existing CBA’s Benefit transfer based on point estimates (kengetallen) Distance decay function/ valuation functions unknown

5. Meta-analysis in proposal Database: Landscape valuation studies; 31 Landscape valuation studies; No uniformity in data; Different landscapes; different valuation methods Different studies based on same dataset Lack of valuation function/ distance decay function Hedonic pricing studies

6. Simplified “Meta-analysis” Valuation studies with valuation function explain heterogeneity in WTP for Landscape. For each study: Which variables are included in the valuation function? Which variables are significant? What is the effect? + or -

7. Simplified “Meta-analysis” Landscape-variables: local, regional, national importance Small, medium, big change Sociaal-demografic variables Distance Income Age Household composition

8. Rule of thumb for the Netherlands? Emperical study, focused on the aggregation question  to determine the total value of nature and landscape areas Meta-analyse: Make explaining variables comparable  elasticity's Study in more detail elasticity meta-analyses

9. Do we continue? Important question, but time consuming to solve. An easy (quick) solution is impossible.