The post below this one, "Mitt Romney's 'Fair Share' " refers to his fair share of the costs of providing public goods.
But perhaps an equally important question is the nature of one's fair share of the output of our economy and the output of the earth. Some of the former output is the result of individual efforts, and one ought to be able to keep that portion. But at the same time we must recognize how much comes from the division of labor, from drawing down on the non-infinite supply of non-renewable natural resources on which all of us today must depend and on which future generations of human beings must rely. Those who draw down more than their legitimate share owe something to the rest of the community. Our wealthiest tend, we suspect, to use many, many times their legitimate share, and the median American likely draws far more than their share, when one considers the planet as a whole.
Perhaps "legitimate" is not the right word here. It refers to what is permissible under current law. (The word gets misused a lot -- see the discussion on "legitimate rape," which seemed to be about the circumstances under which a woman has a right to make a specific very personal, decision, and when it is considered by some to not be left to her and is the province of government, legislators or others.)
What is one's "fair share" of natural resources? America is using a hugely disproportionate share of the world's resources. Are we entitled to it because we're somehow "exceptional"? Because "our" God is somehow better than other nation's Gods? Or do we genuinely believe that all people are created equal, and intend to live our lives accordingly?
Our output of greenhouse gases exceeds our share of the world's population. This is not without consequences for the world, and for peace on earth.
We ought to be re-examining our incentives so that they move us in the direction we ought to be going, which is, to my mind, using less. We can build transportation infrastructure which will permit many more of us to move around with less impact on the environment. We can fund that through collecting the increases in land value that infrastructure creates. We can correct the incentives which cause us to use today's inferior technologies to extract natural resources from the earth in ways which damage the environment, as if ours was the final generation, or the only one worth serious consideration.
Better incentives could reduce, eliminate, even reverse urban sprawl. I refer specifically to land value taxation as a replacement for the existing property tax, particularly in places where assessments are for one reason or another not consistent with current property values -- e.g., California and Florida, parts of Delaware and Pennsylvania which currently use assessments from the 1970s, and many other places where assessments are simply out of whack with current reality!) We should be replacing sales taxes, wage taxes, building taxes with taxes on land value and on natural resources. Most of that value is flowing generously into private or corporate pockets, to our detriment. It concentrates wealth, income, and, of course, political power.
Collecting the rent, instead of leaving the lion's share of it to be pocketed by the rent-seekers, would go a long way to making our society and our economy healthier. Eliminating the privilege of privatizing that which in a wisely designed society would be our common treasure would make our society a better place in which to live, a place in which all could thrive and prosper without victimizing their fellow human beings.