Tesla knocked $2,000 off the prices of three of its five models in the U.S. Tesla knocked $2,000 off the prices of three of its five models in the United States late Friday, another sign of the challenges facing the electric vehicle maker led by billionaire Elon Musk. The company cut the prices of the Model Y, a small SUV which is Tesla’s most popular model and the top-selling electric vehicle in the U.S., and also of the Models X and S, its older and more expensive models. Prices for the...