The most interesting exchange on Tesla's (NASDAQ: TSLA) July 22 earnings call wasn't about margins. An analyst asked CEO Elon Musk whether he eventually sees synergies from combining Tesla with SpaceX (NASDAQ: SPCX), the rocket and satellite company that went public in June. There's "more and more overlap" between the two companies, Musk said on the call. Continue »As for a deal, Musk said he couldn't discuss "combining companies and that kind of thing" in that setting. Tesla, valued at about $1.2 trillion, trades at more than 300 times earnings after this week's post-earnings sell-off.