If at the end of the game you have the Fisher King and you only have six tiles that produce fish... can a market count towards your final fish production?? If so, what if you were using the market for carrots the whole game? Can you switch at the last harvest???
My understanding of that token is that you can call any of the 3 resources each round (so it could be dif. each round), but whatever you choose on the 4th round will be what it represents for your parchments as well.