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>There is no law or ethical principle that a city has to make housing available to all comers at the price they want.

That's essentially what's being litigated in this debate. YIMBYism argues that there is such an ethical principal: society ought to be inclusive, the playing field ought to be level, haves ought not to have too much power over have-nots, etc. We contend that they apply just as much to urban land use as to healthcare, immigration, and tax policy.

Modern zoning is a deployment of state power to help reinforce and grow the asset values of a small group who were in the right place at the right time, valuing their aesthetic enjoyment above others' ability to make a living. Maybe we don't have a positive obligation to create an unlimited amount of affordable housing, but we at least have the obligation not to use the power of the state this way.