Risk Analysis Vol. 35, Issue 2, Pages 318-331 February 2015 HKS Authors See citation below for complete author information. Richard Zeckhauser Frank Plumpton Ramsey Professor of Political Economy Citation Viscusi, W. Kip, and Richard J. Zeckhauser. "The Relative Weights of Direct and Indirect Experiences in the Formation of Environmental Risk Beliefs." Risk Analysis 35.2 (February 2015): 318-331.