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Ⅰ.
mass market UK US noun [C, usually singular] MARKETING, COMMERCE
► a market of as many people as possible, not just people with a lot of money or particular needs or interests: »
There's no mass market for the magazine.
»They sell high-end furniture that is not aiming for the mass market.
Ⅱ.
mass market UK US (also mass-market) adjective [before noun]
► used to describe a product that is intended to be sold to as many people as possible, not just to people with a lot of money or particular needs or interests: a mass market product/brand/car »
For the first time, GPS navigators were seen as a mass market product.
»a mass market retailer/business/company
»The service will not be limited to business users, but will have mass-market appeal.
Financial and business terms. 2012.