Economists have often puzzled over why more people don't invest in energy-efficiency measures that save money over the long run. If it's really so sensible, shouldn't everyone be doing it?
One explanation is that the incentives at work can sometimes be skewed. Matthew Wald points to a fascinating recent post by David Levine of UC Berkeley explaining that people who rent apartments tend to have far fewer energy-efficient appliances than those who own their own homes:
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