Interesting Questions Worthy of Further Study: Our Reply to Desvousges, Mathews, and Train's (2015) Comment on Our Thoughts (2013) on Hausman's (2012) Update of Diamond and Hausman's (1994) Critique of Contingent Valuation. (9th February 2016) - Haab, Timothy C.; Interis, Matthew G.; Petrolia, Daniel R.; Whitehead, John C.