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0 pointsclose042y ago0 comments

The market share is the percentage of the market, up to 100%. The market might grow due to the different measures adopted but percentage wise it will always be limited to the whole being 100%, split between however many players. Everyone's share increasing means the market going above 100%.

What OP means is that it's a mathematical impossibility for everyone's market share to increase. It's a zero sum game, for any player's market share to increase, someone else's must decrease.

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danaris2y ago

I think that what the GP is saying is that they could each be correct, individually, but not all collectively.

close04OP2y ago

> they could each be correct, individually

In that case "They could all be right that their market share might be higher". Because they never operate individually, in isolation. Two people can predict opposite outcomes that could be correct for a coin flip but only one is correct.

More on the point, I think they all invest in the same strategy not because they know they'll win but because they know without it they'll lose. Even so it's guaranteed that some of them will lose.

RGamma2y ago

The collective case is called https://en.wikipedia.org/wiki/Paradox_of_competition btw.

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