Yeah that business model works so well. Without taxes we have a society dependent on people actually taking others into account. No police, no military, no safety regulations, no product monitoring, no highways, no air routes, no harbors, nothing, just I trust you.
The next time that one works will be the first time it works.
Who is advocating no taxes here? This whole thread is about "dynamic scoring" which is about taking into account economic effects of a policy (such as an anticipated economic growth from a tax cut resulting in increased revenues).
If taxes were 0% tax revenue would be 0. Duh!
If taxes were 100% it would choke legal economic activity and tax revenue would be likewise 0. Obviously there must be at least one tax rate for which there is a maximum revenue that balances taxpayers (and their taxable income) with tax receipts per payer. If tax rate is higher than that rate a tax decrease would result in tax revenue increase.
Same for a business and prices.
If your price is 0 (you are giving stuff away) your revenue will be 0.
At some price nobody will come to your store and your revenue will be 0 again.
There must be at least one price that results in maximum revenue that balances number of customers (and number of items each is buying) with what each customer is paying for each item. If your price is above that price reducing prices will result in increased revenue.
Hence my analogy is actually pretty good.
Now what level and kind of taxation is optimal is a different and much more complex issue.