Normally a 50 percent increase in sales is considered very good. But when the number of electric vehicles sold in the United States grew that much during the third quarter of a year earlier, it was a disappointment.
Carmakers and analysts had expected more. Instead of celebrating, auto executives worried that demand for electric vehicles was slackening, raising questions about their plans to invest tens of billions of dollars to develop new models and build factories.
In recent weeks, General Motors, Ford Motor and Tesla cited slower sales and signs that the economy was weakening in announcing that they would