"This paper examines the link between passage of the Plant Variety Protection Act (PVPA), private R&D, public R&D, and genetic diversity in farmers' fields. PVPA did have a limited positive impact on private wheat breeding but did not lead to a decrease in public wheat research. Instead, public...

Technical change is dynamic, recursive, and endogenous to the economic system. However, empirical studies usually treat technology as exogenous, defining technical change in terms of its end result changes in some production possibilities set. An endogenous view of technical change is necessary...