"Sometimes the best solutions are the cheapest. The universal use of masks in public is one of the most cost-effective methods of stopping COVID-19. This is true even when the masks are simple cloth masks that people improvise from materials they have on hand. Multiple studies using different methodologies estimate that this intervention can result in a savings of $3,000-$6,000 for each person who starts wearing a mask, which is incredible for such a cheap intervention. The countries that have beaten back COVID-19 successfully have all made use of universal mask-wearing as a cultural practice, and there’s overwhelming evidence that universal mask-wearing in particular has a significant impact on curbing the spread of COVID-19."