Why does government get to collect rent on transactions between citizens for which they have provided no product or services? How can that be legal?

What else would sales tax be defined as?

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If the government provides no product or services what entitles them to collect anything? Other than that’s just the way it is or whatever consumption tax is. Can I get my cut of your next grocery purchase then? No? Anyone? Then why should government?
Why does government get to collect rent on transactions between citizens for which they have provided no product or services? How can that be legal?
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