"Henry George, the eminent social philosopher of a century ago, turned the attention of planners and economists, however briefly, to the indefeasible factor of land scarcity. Capital and labor can increase; land cannot. Accordingly, George was the apostle of the single tax. It aimed most directly at land speculators. His insights would focus now on the limitations on the use of land imposed by zoning. If John Jones wants an acre protecting his house, he is laying claim to something that cannot expand in size. Since land, in George's analysis, is forever limited, it must be thought of and treated as common property. And therefore the rental value of one acre should constitute a tax (the single tax) on the person who sequesters it for himself. A strong case can be made for the amenities of zoning laws. But they have an effect on the availability of housing, and on its cost. One result is that housing costs are increasing faster than inflation. But is the Henry George factor likely to be espoused in political platforms? It cannot happen soon because too many interests are vested in zoning laws. But sharp political eyes should be trained on the question, in search of a viable formulation designed to fight against homelessness for grandchildren who cannot be expected to pay the projected cost of housing."