If you own a sailboat you know that copper infused paint protects the hull of your boat from barnacles. Plumbers like copper because it kills bacteria. Copper may also be good for your portfolio. To understand why, we need to keep in mind the method the National Bureau of Economic Research uses to define recessions.
The NBER waits until after GDP falls for two consecutive quarters. The lowest quarter becomes the bottom or end of the recession. The next quarter is the beginning of the recovery. Then the NBER gnomes crawl backwards through the data to find the most recent peak of GDP growth. The quarter after marks the beginning of the recession. So we don’t officially learn that we are in a recession until the recovery starts, sometimes 18 months after the recession has begun.