How about “fancy”? One word=Check. Non-zero sum=Not by definition but excess is implied. Let’s wage some fancy on this 
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hmm that's not a bad idea actually. societies with big surpluses typically get into baroque excess golden ages with it
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Why do you say that peace is zero sum? Only a peaceful society brings up kids for the space age or gold rush.
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The space age was driven by war-raised people actually. In fact most of the pioneers were military veterans. Extended peace is rare enough we actually don’t have much data on what it does. We swing from war to unwar and back, barely pausing at peace
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Thriving?
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Consequence, not cause. Like suffering with war.
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There's this Greek word, ophelos, which means to 'heap together' as related to profit, benefit, advantage. So that could be fun to resurrect, but hard. Got me thinking, of "fellowship" - almost certainly a step past 'peace' and exactly the word you need - though gender neutral?
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I'm increasingly satisfied with "fellowship" as the word you need. It's impossible in war or conflict, It's related to one of the types of loves C.S. Lewis discusses, and I think in that 'heavy' sense captures what you need.
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German has a word for it: Blütezeit. The time when plants, or cultures, or economies, bloom.
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I like it
Google Translate suggests
heyday, prime
as
equivalentspic.twitter.com/8cpAGgL3lt
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