Electric vehicle stocks closed the week ending Sept. 17 on a mixed note, as investors reacted to the macroeconomic uncertainty that dragged the broader market lower, analystsâ actions, and a positive policy move. Now, here are the key events that happened in the EV space during the week: Tesla’s Company Updates & Analysts’ Actions: The cost of making a Tesla, Inc. TSLA car has come down by about 57% between 2017 and now, with the improvement coming primarily from better vehicle design and new factory design, Martin Viecha, vice president of investor relations at Tesla, said in a tech conference,…