Studies by the EPA have calculated that the benefits of avoided deaths and illnesses resulting from the Clean Act far outweigh the costs to society of complying with the law. Credit: EPA

Millions of Americans head outdoors in the summer, whether for a day at a nearby lake or a monthlong road trip. For environmental economists like me, decisions by vacationers and outdoor recreators offer clues to a challenging puzzle: estimating what environmental resources are worth.

In 1981, President Ronald Reagan issued an executive order that required federal agencies to weigh the costs and benefits of proposed major new regulations, and in most cases to adopt them only if the benefits to society outweighed the costs. Reagan’s order was intended to promote environmental improvements without overburdening economic growth.

Cost-benefit analysis has been so successful as a tool for policy analysis that every administration since Reagan has endorsed using it. However, it requires measuring benefits that are not “priced” in typical markets. Fortunately, putting a price on non-market environmental outcomes, such as safer drinking water and fewer […]

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