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A nice, brief VoxEU note of Willem Buiter on negative nominal interest rates (and their potential desirability). Greg Mankiw also tackled the topic earlier.
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If you’re at all into arithmetics (and not only) you might like this concise exposé on very big numbers (think Ackerman series, Busy Beavers and the like if you are dubious about what “very big” stands for in this context…).