The following graph from the world bank website shows the world wide military expenditure in percentage of the world GDP over time from 1988 to 2015

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I am trying to find similar data over a much longer period of time. Over the last 3000 years would be ideal! Of course, I realize that such data might result from very rough estimations and might eventually be specific to a certain area of the world and arguably not representative.

Where could I find similar data over a much longer period of time?

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    You're not going to get 3000 years of good data. You're probably not even going to get 100 years. But data for the time period including World War II should be out there somewhere. – Mark Jan 30 '17 at 3:32
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    @ShimonbM world GDP fell in 2009 due to the GFC. Since the graph is a ratio, when GDP falls the graph rises even if spending is flat. I don't know if spending was flat tho. – AllInOne Jan 30 '17 at 18:32
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    I do not have the graph, but I bet that it will show the same trend over the last 500 years. Military expenditures were a great share of total expenditures of pre-modern states. – Alex Jan 30 '17 at 19:48
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    Historical estimates of global GDP can be gotten from Estimating World GDP, One Million B.C. - Present by J. Bradford DeLong an economic historian at UC Berkley. Global military spending comes from the Stockholm International Peace Research Institute (SIPRI) which is what the World Bank is using. While it has data back to 1950, its only complete back to 1988. – Schwern Jan 31 '17 at 1:44
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    This would be a great question for a new SE forum called Militaria. area51.stackexchange.com/proposals/99463/militaria – RichS May 9 '17 at 4:05

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