What are “food”, “hammers”, and “commerce”?
Every tile has a certain amount of food (used by cities to grow its population), hammers (used to build projects such as units, city improvements, and wonders), and commerce (used for science research, spare cash, and potentially extra culture and happiness). For example, a grassland tile has just 2 food, 0 hammers, and 0 commerce. By building certain tile improvements with your workers, such as a farm, you can increase the food to 3, or a hamlet, which will add 1 commerce. Also, resources found on tiles yield extra food/hammers/commerce, making them more attractive than a standard terrain tile. Every citizen in a city, besides specialists and angry citizens that refuse to work, “works” a tile in the city’s radius (it starts out as the surrounding 8 tiles, and after a cultural expansion it goes to 21 tiles, or 2 tiles in every direction except directly north, south, east, and west). The yields from the tiles that these citizens are working make up that city’s total food per turn, hamme
