> However, in principle, I agree with the idea of having a cashless economy, so that government has data to see who is lying in their tax returns.

This is really bad, because it prevents any kind of privacy. Want to buy a huge dildo from HugeDildos Inc.? Now you can just pay with cash. With cashless economies, you will now have their company name on your bank statements.

And this is just a stupid example. What do you do in a case where you have legalized Marijuana at a state level and illegal at federal level (like in us). You can sell it in your state, but you cannot get a bank account.

And what happens if there's a blackout? How do you buy food?