There are about 2,900,000 registered passenger vehicles in the Detroit area. Some are cars. Some are trucks. Some are Hondas. Some are Fords. Some are Teslas. Some have four doors. Some have two. Some go fast. Some go slow. Some guzzle gas. Some sip. Some are red. Some are blue.

The one thing that almost every car and truck in the Detroit area have in common, though, is the AM/FM radio smack-dab in the middle of the dashboard.

The first car radio went on sale in 1930. It was an invention of the Galvin Manufacturing Company. The company named the radio 'Motorola,' and its cost was $130, around $2000 in today's dollars. By 1935, more than three million car radios had been installed.

Today, AM/FM radio is part of every car and truck on Detroit area roads. In addition to the radio, many of these vehicles also provide drivers with other audio options, including a CD player, Sirius/XM, Pandora, Spotify, podcasts, and easy access to personal MP3 collections.

It is fair, then, for small business owners who depend on Detroit radio to advertise their goods and services to ask: with all the audio options on today's dashboards, is anyone listening to local AM/FM radio in the car anymore?

In 2020, there were 251,685 new cars and trucks registered in the Detroit metro area. This number is based on projections from the National Auto Dealers Associaton (NADA) and the U.S. Census bureau.

In all, says NADA, there are 614 new-car dealerships in Michigan. Despite the pandemic, these dealers, including those in the Detroit area, sold $38.2 billion worth of new vehicles.

Through June of this year, these same dealers have already rung up $20.5 billion in new car sales.

When it comes to buying new vehicles, Detroit consumers have a broad range of preferences. Some buyers want Fords while others want Chevrolets, Toyotas, or Teslas.  Some buyers want pick-up trucks, while others want sub-compacts, SUVs, or sports cars. Of course, some want blue vehicles, while others want pearl white, orchard green, or redolent red.

There is one purchase criterion, however, that most Detroit car buyers can agree on. They want an AM/FM radio smack-dab, in the middle of their dash.

There are more than 2,900,000 vehicles registered in Southeast Michigan. Many need new windshield wipers, shocks, struts, brakes, air filters, ignition coils, and the hundreds of other items that fill the shelves of local auto part dealers.

Despite the pandemic induced slowdown, business at auto parts stores has grown nearly 13% since February, according to the US Census Bureau.

This explosive growth in auto parts sales directly relates to the  average age of cars on Detroit's roads.

"Per the latest study from IHS Markit, the current combined average age of vehicles has hit a record of 11.9 years," Rimmi Singhi wrote this week on NASDAQ.com. "The aging vehicles are a boon to auto parts, replacement, and repair companies. In a bid to ensure long-term functioning of the aging vehicle population, customers are making investments to replace faulty vehicle parts and components."

Also contributing to the rapid aging of cars on the road is the current demand for used versus new vehicles. According to the Bureau of Economic Analysis, the personal consumption expenditures (PCE) for used cars is 25% higher in August than it was during the same month last year.

At the dawn of 2020, Metro Detroit small business owners were expecting the area's retail economy to expand by 4.1%. This optimism was stoked by the National Retail Federation's chief economist who said, "Consumers remain upbeat and have the confidence to spend, and the steady wage growth that has come with the strong job market is fueling their spending. The state of the consumer is very healthy."

By February, however, the country entered into a COVID-19 induced recession. Then, to slow the spread of the pandemic, on March 24, the Governor of Michgian locked the state down. This brought the Detoirt area's $78,3 billion retail economy to a standstill.

As stores, restaurants, and offices in the Detroit area begin to re-open, consumers' appetite for spending is returning. According to Nielsen, loyal radio listeners are very likely to be first in line at the cash registers.

"Our franchisees love advertising on Detroit radio," says Katherine Villeneuve, Director of Marketing & Franchise Support for Auto-Lab. "They understand that radio reaches the masses, and can achieve the messaging frequency to be effective."

Auto-Lab started in 1989 as a single-independent store in Sturgis, Michigan. The company has expanded to include 21 franchises across the country. Nine of the stores are located in Metro Detroit, each operated by a local, small business owner.

Auto-Lab offers consumers the same diagnostic, maintenance, repairs, and parts as a car dealership's service department but, for what Ms. Villeneuve describes as a 'fair price'.

To drive traffic into one of Auto-Lab stores in Southeast Michigan, each franchisee contributes 3% of their gross sales to a cooperative marketing fund. Ms. Villeneuve then works with the owners to create persuasive, annual advertising campaigns.

"Each of the owners has input into how the money is spent," she says. "Afterall, because they are in the stores every day, they have the best sense who their customers are."

For the last four years, the Metro Detroit Auto-Lab owners have chosen advertising on Detroit radio as the primary way to reach new customers.