I have recently been trying too specialize my cities, but the thing is that I cant\wont understand why people are putting cottages on floodplains in a commerce city. Example: If I have a commerce city with: 4 plains, 2 hills, 4 floodplains and 10 grassland. I my head it would be best to cottage everything exept the hills and 2 floodplains, wich I would mine and farm. The reason I would like to farm floodplains instead of the grassland is that I would still have the +1 commerce from being adjacent to a river with the floodplains, but not on the grasslands. (Or am I completely wrong ?) Perhaps a bad example but my point is that most people seem to cottage every floodplain tile?