There are people who believe that colloidal silver has special medicinal properties, and take it as a form of supplement. It’s a joke about those people, including the ones with skin tone side effects.

The reason that the stock market cratered in response to this was that regular consumers are about to get hit with a 25%+ price increase on literally everything they buy. If you don’t make 25% more paycheck, you’re going to be cutting your lifestyle by the difference. Companies know this and are anticipating major lost revenue because people won’t have money to spend on their products. The price increases are probably going to be in full swing in 2-3 months, but that’s an educated guess, only.