The stock market, which is a representation of transactions and not a physical reality, is commonly described as a roller coaster. The reasons for this are understandable: that fun thing you ride at the amusement park sounds way cooler than “the aggregation of buyers and sellers,” even if that’s what the stock market actually is. Stock markets are not above using this hackneyed metaphor. Nasdaq’s website, for instance, is rife with headlines that reference roller coasters. The aggregation of buyers and sellers does not sound cool.  The fun-loving folks at the Wall Street Journal have, at long last, turned the…