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...data are not the result of its own self-production. The way the computer works remains the same, whether it is processing pictures from the National Gallery or whether it is processing letters of the alphabet. The rules that relate input to output are constant over time. The question of what I can know about the outside world is an ancient one and has always been central...

...data on income is more readily available than on wealth. Public bodies collect information on earnings for purposes such as tax. The nature of wealth means that it is more difficult to measure: a large part of wealth consists of the assets a household owns. The changing value of an asset is difficult to evaluate; asset prices might be rising but unless the asset is sold...