The program, known as Book by Cadillac, charges $1,500 a month and lets drivers cancel anytime. The premium service grants access to 10 Cadillac models. Using a smartphone, customers can trade in their vehicles up to 18 times a year. So far, the program has only been available in the New York City area, but in light of its popularity, it could expand to other big cities, Cadillac said.

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“There's potential for global expansion,” said Andrew Lipman, a Cadillac spokesman. “There are a lot of ways we can expand this. But we want to hone in and perfect the program here in New York first.”

The Cadillac project is targeted at consumers of luxury vehicles. But GM has also explored a similar business model in its more mainstream Chevrolet line, with a test program launched earlier this month known as Maven Reserve. That service allows drivers in Los Angeles and San Francisco to rent a Chevy Tahoe or Volt for up to 28 days for a flat monthly fee. Both programs appear superficially similar to leasing, but are more expensive, cover maintenance and insurance and come with added perks, such as Cadillac's on-the-fly swapping system and Maven's offer of $100 worth of fuel and a dedicated parking space for each rental.

The two programs reflect a big bet on the future of car ownership. At a time when rising debt and lower wages have forced some Americans, particularly younger ones, to put off major purchases such as homes and cars, alternatives to traditional car ownership are poised to become more common, said Johanna Zmud, a senior research scientist at Texas A&M's Transportation Institute. Other factors contributing to a long-term shift in ownership patterns are changing marriage rates, said Zmud, as well as a growing tendency for Americans to congregate in dense urban areas.

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Shifting beliefs about ownership are not only giving rise to vehicle sharing, but also greater flexibility in vehicle types. Rather than purchasing and holding onto the same car for a decade or more, consumers who use car subscription services are able to choose different vehicles to suit different needs on-the-fly. For example, the same car subscription could allow drivers to select a fuel-efficient sedan for weekday commutes while letting them switch to an SUV for weekend getaways.

Some competitors to GM have begun to offer this feature, as well. Car2Go, which serves D.C. along with New York City, Portland, Ore., and Austin, recently expanded its fleet of tiny, zippy Smart cars to include larger Mercedes-Benz sedans and SUVs. Those vehicles can be rented on daily, hourly and by-the-minute rates. For short trips across town, Car2Go's prices are competitive with those of ride-hailing services such as Uber or Lyft.

Both of GM's programs are substantially more expensive. Even Maven Reserve, which is targeted at Chevy drivers, costs upward of $1,100 a month. Beyond the largely affluent markets where it's being tested, it is unclear whether there is much of a market for GM's subscription services. BMW had considered offering a similar platform for its vehicles, but balked at the business case, according to the Wall Street Journal.