The news of Tesla's Model Y becoming the world's bestselling car is a significant milestone for the company, showcasing the growing demand for electric vehicles and Tesla's strong market position. The upgraded Hardware 4 self-driving setup also adds value to the Model Y, potentially attracting more customers. This is likely to have a positive short-term impact on Tesla's stock price.

Toyota's RAV4 and Corolla models being surpassed by Tesla's Model Y in global sales rankings indicates a shift in consumer preferences towards electric vehicles. This could have a negative short-term impact on Toyota's stock price as it highlights the increasing competition in the automotive market and the need for Toyota to adapt to the growing demand for electric vehicles.