bilby
Fair dinkum thinkum
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We have supercomputers and vast real-time data collected by satellites and ground stations, and we still can't predict the weather to an arbitrary degree of accuracy over short timescales. The reason for this is that complex dynamic systems, like weather and economics, are chaotic - model outputs can diverge wildly from each other in very small numbers of cycles due to incredibly small variations in input.
Modelling based on a perfect and accurate record of all transactions cannot work for a useful amount of time before they break down due to unpredictable elements of the environment - indeed the weather is one such element. You can't use this week's umbrella sales as an indicator of sales for the same week next year; sales depend on non-economic factors.
It's known to be impossible to predict the weather more than about four days in advance with reasonable accuracy (and even that relies on a very woolly definition of 'reasonable'); it's impossible to predict the economy without an accurate weather forecast, and an accurate political forecast, and accurate forecasts of a whole bunch of other factors, any one of which, if slightly wrong, could lead your model to be total garbage.
Central planning of an economy is mathematically impossible. It doesn't matter how powerful your computer is; the only way to get accurate results is to look at the actual economy; and not only can you not see the future with that methodology; you are being over ambitious if you are trying to see the present. That's why governments produce quarterly statistics only many weeks or months after the end of the quarter to which they relate.
With totalitarian and universal data collection and hugely powerful computers, it might be possible to get a grip on what happened yesterday. It will never be possible to accurately and reliably predict what will happen tomorrow.
Aren't all economic systems technically reactionary?
Technically, central planning is predictive - GOSPLAN attempted a series of Five Year Plans, which implied balancing the production of resources and intermediate assemblies and parts with the planned production of finished goods, all founded in a projected target in each sector of the economy; so the first Five year Plan in 1928 attempted to predict requirements in the economy for materials at all levels out to 1933.
This was, of course, a failure, because as I set out above, while economic systems may be predictive, economies themselves are necessarily reactive - it is mathematically impossible for a predictive system to actually work, partly because of non-economic variables (such as weather, natural disasters, political decisions, fashion, war, and a host of others); But mainly because accurate prediction of the future state of a chaotic system is mathematically impossible without a perfect model of the same granularity as the system being modeled - and such a perfect model is a practical impossibility even if you could get away with assuming that all those non-economic variables were known (and of course that's an absurd assumption).