A game where all the value is in play at the beginning and none is added or created as you go.
If we’re playing poker, just the two of us, then every chip you lose i gain that exact chip and every chip i lose you gain. At the end of the round there are exactly as many chips on the table as there were before the round. If you add up all of my gains and losses, then combine that with all of your gains and losses it will all sum up to zero.
Now if we’re playing something different, like Monopoly, it may be a non-zero sum game. In Monopoly you can lose money to other players and if this were the only way money changed hands it would be zero sum; however, you can also lose money to the bank or earn money from the bank(crossing start) which means that at the end of the round you can finish with a lot more money in play than was dealt out at the beginning making monopoly a **Non-Zero Sum Game**
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