<human>:  Why is it called Harley-Davidson?
<bot>: It’s named after its founders, William Harley and Arthur Davidson. William Harley was a mechanic, and Arthur Davidson was a businessman. They both loved motorcycles, and they wanted to make a motorcycle that was affordable for the average person. They had a difficult time finding a way to make a motorcycle that would be affordable, so they invented the engine that is still used today. The first motorcycle was built in 1903, and the company has been making motorcycles ever since.