[D] David MacKay on Random bits being expensive

So I'm reading "Information Theory, Inference, and Learning Algorithms" (great book by the way for anyone who hasn't heard of it) and I stumble upon this passage:

> The arithmetic model is guaranteed to use very nearly the smallest number of random bits possible to make the selection -- an important point in communities where random numbers are expensive! [This is not a joke. Large amounts of money are spent on generating random bits in software and hardware. And Random …

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