Fee dynamics seems to come up over and over again in these discussions,
with lots of talk and theorizing.

I hope some data on what is happening with fees right now might help, so I
wrote another blog post (with graphs, which can't be done in a mailing list
post):
   http://gavinandresen.ninja/the-myth-of-not-full-blocks

We don’t need 100% full one megabyte blocks to start to learn about what is
likely to happen as transaction volume rises and/or the one megabyte block
size limit is raised.

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Gavin Andresen