Here are entered works on areas within which or arrangements by which many buyers and sellers are brought into contact with one another in order to exchange goods or services. Works on public gatherings at a stated time and place at which goods are exhibited and sold are entered under Fairs. Works on competitive exhibitions of farm products, livestock, baked goods, etc., with prizes for excellence, often combined with carnival-like entertainment, and held annually by states, counties, etc., are entered under Agricultural exhibitions.
Here are entered works on an internationally regulated, market-based "cap-and-trade" program designed to reduce the emission of polluting gases into the atmosphere by allowing participating polluting nations or companies to either reduce their total emissions or buy credits from less polluting nations or companies. Works on the practice of compensating for the carbon dioxide emissions produced by one activity or in one location, by voluntarily paying for a corresponding reduction in such emissions produced by a different activity or in a different location are entered under Carbon offsetting.