Supply chain shortages are showing up across the nation. Some items, such as chlorine for America’s pools and used cars, just illustrate a lesson we need to learn. The chlorine shortages illustrate why supply chains are so important and how fragile they can be when faced with something as devastating as the pandemic. Last year, when lockdowns kept most Americans hunkered in their homes, an enormous home improvement wave swept through the country. Demand for home offices on the inside, and new recreational improvements on the outside, skyrocketed. Gazebos, firepits, and swimming pools were just some of the items that…