The government has always been able to shut you down. If they wanted to, they would pull you aside with no recourse and the police would execute civil forfeiture (see also: steal) against anything on your person, car or home. Cash makes this worse.
Nor does it save you from 90% of transactions you do. Banks will know when you deposit/withdraw money. Stores know the moment you walk in. Unless you deal purely in cash (and I mean PURELY) someone somewhere will know when and how you're spending your money.
If you want to deal with privacy concerns then it needs to be codified in law. And that involves dealing with the entire chain, not just point of sale and not just thinking cash will save you.
Nor does it save you from 90% of transactions you do. Banks will know when you deposit/withdraw money. Stores know the moment you walk in. Unless you deal purely in cash (and I mean PURELY) someone somewhere will know when and how you're spending your money.
If you want to deal with privacy concerns then it needs to be codified in law. And that involves dealing with the entire chain, not just point of sale and not just thinking cash will save you.