In the interest of giving credit where credit is due, my avatar is a scan of a hand-drawn caricature by cartoonist Jim Naylor which was done at my company's 20th anniversary dinner.
Black Eagle wrote:
"You may trade any commodity at 2:1 rate" -
does that means I can trade any 2 resources and get a commodity, or do I have to trade 2 commodities to get a different commodity?
Looking at the rules PDF, this appears to be described under the heading Counting House, although the illustration shows Merchant Guild. However the full description in the rules is clear enough:
Cities & Knights rules wrote:
Counting House (yellow): You may trade commodities (of the same type) 2:1 for any commodity or resource. You may make this trade only during your turn, as if you were using a harbor. This special trade advantage does not include resources, only the three commodities.
In short, 2 commodities for 1 commodity or resource.