Pull up a chair. If the last few years have felt like the market is throwing a party that your paycheck wasn't invited to, you're not imagining things. Economists keep circling back to one comparison: the 1920s — roaring stock markets, cheap credit, a wave of new technology promising to change everything, and a wealth gap quietly widening underneath the good headlines. A century later, the pattern is showing up again, and understanding the K-shaped economy driving today's eco