Radio market

In the United States, radio markets are generally a bit smaller than their television counterparts, as broadcast power restrictions are stricter for radio than TV, and TV reaches further via cable. AM band and FM band radio ratings are sometimes separated, as are broadcast and cable television ratings. Market researchers also subdivide ratings demographically between different age groups, genders, and ethnic backgrounds, as well as psychographically between income levels and other non-physical factors. This information is used by advertisers to determine how to reach a specific audience. In countries such as the United States, media regions are defined by a privately held institution without government status; in countries such as the United Kingdom, government-run television stations map their own regions.