Commodities
One of the main additions to the game is commodities, which are a type of secondary resource produced only by cities. Like resources, commodities are associated with a type of terrain, can be stolen by the robber (with Seafarers, also the pirate), count against the resource hand limit, and may not be collected if the robber is on the terrain. Resources may be traded for commodities, and commodities may be traded for resources. Commodities can then be used to build city improvements (provided the player has a city), which provide additional benefits.
The commodities are paper (which comes from forest terrain), coin (from mountain terrain), and cloth (from pasture terrain).
When combining Cities and Knights with Seafarers, the rules are ambiguous with regards to whether commodities are collected along with normal resources when collecting from a Gold River tile, as well as whether or not commodities can be collected directly from Gold River tiles.
A city on grain or brick gives two of each, as in the original Settlers. A city on wool, ore, or wood, produces one corresponding resource as well as one corresponding commodity (cloth, coin, or paper). Grain and brick, however, are used for new purchasing options: grain activates knights, and brick can be used to build city walls.
In total there are 36 commodity cards: 12 paper (from forest), 12 cloth (from pasture), and 12 coin (from mountains).
Read more about this topic: Catan: Cities & Knights
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