Tarsnap - Why picodollars and attodollars?

There are three major reasons why Tarsnap pricing is defined in terms of picodollars ($10-12) per byte rather than dollars per gigabyte:

Unlike some people, I don't believe in rounding up to $0.01 — the Tarsnap accounting code keeps track of everything in attodollars ($10-18) and when it internally converts storage prices from picodollars per month to attodollars per day, it rounds the prices down to benefit the customer.

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