All the big blocks: EU, US, South Korea, Taiwan, and China assume that their subsidy policies will expand their market share. Obviously they cannot all be right. The only that I think is given that will expand its global market share is China. Paradoxically because of the US sanctions and the fact that it relies so much on imports presently.
> Obviously they cannot all be right. They could all be right that their market share will be higher if they adopt this policy than if they don’t.
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.