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The mortgage interest deduction is perfect for my point. Now that spreading the population out to the suburbs has proven to be bad for energy consumption, there's a growing trend toward more urbanization - and it might be considered a legitimate government interest to promote fleeing the suburbs, just as the mortgage deduction favored fleeing the cities. So because times and circumstances change, taxes cannot?
I understand the complaints of those whom the change doesn't favor, but I t think that's besides the point of behavioral tax policy.
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