Evie
Pronounced like Eevee
I mean, yes, if they can't be traded then there isn't a problem. But I was thinking that ressource introduction could work well with a form of strategic resource trading (ie, securing the resource from neighbors so you can start your own farming if you don't have it within your borders). If there is no such trading then there is no such problem.
My loose thinking was that, rather than having "introduction of the resource" (however that would work) give a bonus to farm, it should allow construction of the appropriate type of farm. My initial idea was that you could build (say) a Rice Farm if you either A)had the wild rice resource on that tile OR
B)had access to the wild rice resource from an improved wild rice tile in your empire OR
C)had access to the wild rice resource via trade with another empire that has an improved wild rice tile OR
D)had an adjacent Rice Farm.
But I could see simplifying B and C to allow the building of Rice Farms in any city that has a trade route with another city that has a rice farm.
My loose thinking was that, rather than having "introduction of the resource" (however that would work) give a bonus to farm, it should allow construction of the appropriate type of farm. My initial idea was that you could build (say) a Rice Farm if you either A)had the wild rice resource on that tile OR
B)had access to the wild rice resource from an improved wild rice tile in your empire OR
C)had access to the wild rice resource via trade with another empire that has an improved wild rice tile OR
D)had an adjacent Rice Farm.
But I could see simplifying B and C to allow the building of Rice Farms in any city that has a trade route with another city that has a rice farm.