Stocks hardly reacted to the first part of a trade deal with China last month, but the U.S. assassination of Gen. Qassem Soleimani and new tensions with Iran have caused a stir. Today, we’re going to dig into how unpredictability riles markets and what it means for events to be “priced in.” Plus: What the low trade deficit does and doesn’t tell us, modern email etiquette and how the #MeToo movement has changed the American Economic Association’s annual conference.