First, we should talk about what we mean by “viable”. I think that this commenter is using viable to mean that it makes economic sense to do it. Government action, like subsidies or fees, can change the equation of whether something is economically viable or not. For example, if flood insurance on the free market would cost $1000 a year for every $10,000 in property you wanted to insure, constructing homes on flood plains wouldn’t be economically viable. If the government subsidizes it so that it costs $10 a year, then it becomes viable and……….to read more, go to: http://blog.alextiller.com