Although MicropaymentsForAndAgainst seemed to show micro-payments weren't likely to work Rexblog talks of Apple doing it via iTunes :

How can this be possible?

  • Well, 99c isn't really trivially micro. It's quite a lot. So in fact, this is a larger granularity transaction than those envisaged. The perceive value of the transaction may outweigh the TransactionCost of making the decision.
  • Rex envisages DJs becoming aggregators. That's a smart idea. DJs are aggregators / curators. We trust them, to a certain extent, in that role.

See also :

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