About the Authors

Tatsuya Koga

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Validation, Visualization, Writing – original draft, Writing – review & editing

koga_tatsuya760@ffpri.go.jp

☯ The author conducted this research independently.

Affiliation Department of Forest Policy and Economics, Forest and Forestry Products Research Institute, Tsukuba, Ibaraki, Japan

Competing Interests

The Forestry and Forest Products Research Institute (FFPRI), to which I belong, is an organization that appeared in the policy subsystem in Periods 1 and 2, but I declare that there are no known competing financial interests or personal relationships that could affect the research reported in this paper. This does not alter my adherence to PLOS ONE policies on sharing data and materials.