Measuring is key to the functioning of the economy and to its insertion in society at large. It is needed for pricing (more generally as input to micro-economic decisions) and for the global representation of the state of the economy and society at various geographical scales, as well as to set the basis for the application of tax. Which information is produced, aggregated, used in models and when discussing policies has always been a major political choice. Measuring intangibles and their exchanges in a fast moving technological world is difficult. Should one measure bits, time spent by users, transactions, relative choices, etc.? How can one compare systems that differ not only in price and performance, but also in functionality?

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