the (something) market
A "market" is a large group of people that you are able to sell something to. Companies usually try to focus on a specific "market" that belongs in a certain geographical area and includes people of a certain age, gender, and income.
You can discuss a certain market by using the expression "the ___ market". Some examples are:
- the stock market
- the automotive market (cars)
- the fiction publishing market (printing novels)