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.

The local currency, though, is intended not as collectible but to encourage trade at the community businesses where they are accepted, rather than chain stores, where money taken in tends to flow out of town and into the coffers of multinational corporations. (Compare it to the farmers’ market: Homegrown lettuce now has a whole new meaning.)