In a zero sum game, winnings and losses balance out among the players. Futures and many options trades between private parties are often described this way before costs. Ordinary share investing is not purely zero sum, because companies can create value over time and raise the overall pie.
Key takeaways
- If someone profits only because someone else loses the same amount, the structure is zero sum.
- Trading costs and fees make the real world slightly negative sum for the group of traders as a whole.
- Long term equity ownership can benefit from growth, dividends, and innovation, which is a different economic story.
- Labelling a market zero sum is a warning about who sits on the other side of your trade, not a reason to avoid all risk forever.