Public funds are used for many things to improve quality/richness of life like museums, art, playgrounds, and parks. Economic ROI is difficult to quantify as things like desirability and quality of life are not easily tested. For example, take all of Calgary's parks, architecture, etc and put bland billings in place. Likely a better ROI on those buildings, but probably not the best spend of the money.
As other posters have said, I support some public money, but far from 100%
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