We need to hammer this part because it's core to why radio isn't like it was. At one time, towns had local department stores. That may seem hard to believe, but it's true. Local versions of Macys.
True. In fact, as a kid growing up in Los Angeles, Macy's wasn't even in the picture. Bullocks, Buffums, Orbach's, I. Magnin, Joseph Magnin, Desmond's, J.C. Penney, Sears, Montgomery Ward, The Broadway and Hinshaw's were all going concerns through the 70s...and most of them advertised on radio. Macy's, through a series of mergers and acquisitions, ended up owning the remains of the higher-end stores.
And it was true even in small towns. When we moved to Bishop (population 3,000), the town had its own hometown department store, Conder's. And another one specializing in western wear, The Toggery. Plus a local J.C. Penney store and catalog stores for Montgomery Ward and Sears. They all advertised on KIBS. In the late 80s, KMart (which didn't advertise locally) moved in. The only survivor was The Toggery.
The only chain restaurants in Bishop were A&W Root Beer, Fosters Freeze and (after 1968) Kentucky Fried Chicken. All were locally-owned franchises who could use what was known as co-op dollars from the chain to buy local advertising, and they did. And the real mom & pops advertised too. Now, it's Jack in the Box, McDonald's, Carl's Jr., El Pollo Loco, Subway, Denny's and two Starbucks---none of which buy local airtime, and many of whom sent mom and pop off to retirement.
EVERY car dealer in town bought airtime. We had an International Harvester/Jeep Dealer, a Chrysler-Plymouth-Dodge dealer, an AMC-Pontiac-Buick-GMC-Toyota dealer, a Volkswagen dealer, a Chevrolet-Oldsmobile-Cadillac-Datsun dealer, and a Ford-Lincoln-Mercury-Mazda dealer. That's six car dealers. Today, there are two. If you want anything other than a Toyota, Honda or Ford, you have to go to Carson City, Nevada (170 miles) or Lancaster, California (200 miles) and neither of them are buying Bishop airtime.
There were three record stores, two selling stereo equipment (one leaned more toward home units, the other toward car stereo) and the third selling sheet music and musical instruments. Gone as soon as K-Mart hit town.
There were three appliance dealers, selling TVs, kitchen and laundry appliances and the like. K-Mart ate that business.
There were four banks, Bank of America, Security Pacific Bank, The Inyo-Mono National Bank and a fourth savings and loan whose name I'm blanking on. And the bigs--BofA and Security---bought local airtime because they were competing for deposits in a small town. It's now Chase and Union, and they don't advertise.
There are probably five or more other categories, but you get the idea. The ad market is nothing compared to what it was 40 or more years ago, even in a town that small.