In 23 B.C., the Roman poet Horace advised “carpe diem,” or “seize the day.” Now, get ready for the 21st-century spin on it: carpe diem trading. Last week, the Financial Industry Regulatory Authority signed off on changes that would scrap a minimum equity rule that keeps many retail traders out of so-called “pattern day trading.” Pending approval from the US Securities and Exchange Commission, it will open up a new investing avenue for one of the market’s most aggressive cohorts. READ ALSO: Wall Street Bra ...