MIT Technology Review Jan. 6, 2020

Think about the last time you used cash. How much did you spend? What did you buy, and from whom? Was it a one-time thing, or was it something you buy regularly?

Was it legal?

If you’d rather keep all that to yourself, you’re in luck. The person in the store (or on the street corner) may remember your face, but as long as you didn’t reveal any identifying information, there is nothing that links you to the transaction.

Read more ....