You don’t need a brain like Jeff Bezos to figure out why he began selling books online and not cars.

Books are a cheap and easily-shipped commodity product. By contrast, people rarely buy a car without driving it first, while vehicles are bulky and customization options abound. There’s more: new cars are typically bought on credit. Manufacturers and dealers tend to have tight-knit relationships, and in the U.S. there are pesky laws protecting dealers (as Tesla has discovered).

Still, besides a few exceptions — bullets and cigarettes — Amazon.com Inc is getting closer to the Bezos dream of being an “everything store”.

So after reports that Amazon is considering a move into prescription drugs, we shouldn’t be surprised that it’s started recruiting auto experts to help it sell cars in the U.K., according to trade magazine Automobilwoche. Details are sketchy, but the article was enough to sink the shares of Auto Trader Group Plc, a British digital automotive marketplace, by about 4 percent.

That might be an overreaction. While Amazon enjoys huge sales of books, entertainment products and consumer electronics, its march on other areas such as food and fashion has been slower. Like cars, those businesses have specific demands. To sell fresh food you need temperature-controlled infrastructure, while clothing returns involve tricky logistics.

Amazon’s car ambitions are evolving slowly too. Last year, it set up a car research tool for its users and said it would offer a small number of vehicles on its Italian site from Fiat Chrysler Automobiles NV. While Amazon helped create a…