"Once a marker of a business with suspicious tax practices, the phrase 'cash only' has come to signify hipster entrepreneurialism at places like Stumptown Coffee at the Ace Hotel in Midtown Manhattan or the Emerson Bar in Brooklyn."

"... Many of the new alternative currencies have the look and feel of the regular legal tender accepted at such places. Most include anticounterfeiting measures like holograms and serial numbers. But they are more eye-catching. At the Effra Social, a Brixton pub, Ewan Graham, 31, an architect, was impressed upon examining one of the district’s special pound notes for the first time. 'I’d be more inclined to save money if it all looked like that,' he said. The back of the note displayed a Karl Marx quote about capital and its 'occult ability to add value to itself.' The £10 note, meanwhile, pictured David Bowie, a Brixton native (stardust, or other powdery substance, not included). It’s easy to imagine such notes being fetishized as audiophiles do vinyl...."

And it's easy to imagine suspicious tax practices... even by "hipsters"!

The article — in the NYT — is "Do You Have Change for a Bowie? The Advent of Artisanal Cash."