Tesla teased an Oct 7 event, in which investors and analysts anticipate a more affordable model to sustain sales momentum, sending the shares of the Elon Musk-led electric automaker 3 percent higher in early trading on Monday. In a nine-second video posted on social media platform X on Sunday, Tesla showed a vehicle with its headlights illuminated in a dark setting, while hinting at an event set for Tuesday in a separate video that had "10/7" at the end. Tesla has previously delayed rolling out a lower-cost version of the Model Y in the US. It said in June it had made "first builds" of the vehicle, but would start selling it in the fourth quarter and ramp up output...