Usage is slightly different if the market is financial, such as a stock or commodities market. Buying and selling of stocks refers to "the stock market". A particular, but still abstract, instance is "the European stock market". A named market is a proper noun, often a physical entity, such as the Paris Bourse or the London Metals Exchange (LME). More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.