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I once passed through Andorra, it's main city looked like a giant tax-free shopping area. It was terrible, only slightly better than sitting in an airport.

Shush... they are cute little innocent countries. Lots of culture, many heritage, very architecture.... and a little bit of inbreeding.

Did you read the article? San Marino doesn’t do much of this.

Maybe not now (and not in the last 15 years or so), but San Marino was VERY well known for being a "cash" place where money was passed around and you could do "nero" (avoid taxes, avoid invoices, etc). So it's not totally wrong.