Hank Greenberg’s email to investors discussing Southwest’s screwup exposes a myth of margins, how Tesla is hurting ETFs, and his 2023 predictions. Southwest’s ScrewupIf there’s one moral to Southwest Airlines’ (NYSE:LUV) screwup last week with thousands of canceled flights, it’s this… Companies spend woefully little on tech. What happened at Southwest is really little more than something that has been hiding in plain sight for years. Q3 2022 hedge fund letters, conferences and more Simply ask yourself: How many times have you heard a retail clerk or customer service agent say, “My computer is …