Optimism among the nation’s small business owners hit a seven-month low as they continued to struggle to find both people willing to work and supplies. The National Federation of Independent Business (NFIB) reported its small-business confidence index fell 0.9 points to 98.2 last month. It was the lowest reading since March. Businesses are facing one of the worst labor shortages since World War II. More than 4 million people left the workforce during the pandemic and haven’t returned.