In Energy Trading a Market describes a standardized trading environment for a commodity and a geographic zone

The geographic zone is not necessarily the delivery location, but usually determines the valuation of the traded commodity

For example API#2 is a market based on the published index for coal in the Amsterdam, Rotterdam and Antwerp (ARA) location; a trade may deliver coal to a port in France but still be part of the API#2 market

Detail

A market combines attributes of commodity and location and may have an associated calendar and business rules, which provide defaults for any trade associated with the market

Some delivery locations are also markets, so far example NBP is a gas location and also market

Note the similarity and difference to a Master Agreement which has similar attributes