Difficult to define it, but we can be pretty sure we're nowhere close with our current tax policies. In theory you set the tax rate to counteract the net negat

Difficult to define it, but we can be pretty sure we're nowhere close with our current tax policies. In theory you set the tax rate to counteract the net negative externalities. It's estimating those externalities that's the source of contention (as you hint at re: feedback loops). So assign ten teams to estimate it and take the median?