The Economist does an excellent job laying out the many issues in measuring GDP and using it as a measure of prosperity here: http://www.economist.com/news/briefing/21697845-gross-domestic-product-gdp-increasingly-poor-measure-prosperity-it-not-even
Here is a chart showing revisions three years after the first estimate:
I’m not sure why macroeconomists use decimal points when forecasting GDP…
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