How does this business of fire fighting make money? All they do is spend money on equipment, labor, etc. Where is their income coming from, and who is incentivized to keep paying them despite no profit and no return on investment ever?
It doesn't, but the community decided that it was valuable, so chose to fund it using taxes, collectively. If you make the case to your community for a communal grocery store, it too can be funded with taxes. Be warned, it comes with its own set of problems that are hard to predict at the outset.
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