SummaryLarge 1-day rallies are usually associated with the bear market rallies.Major bottoms require a policy change.The Fed is still in inflation-fighting mode.gonin/iStock via Getty ImagesThe top 20: daily returns for S&P500The SPDR S&P 500 Trust ETF that tracks the S&P500 soared by 5.5% Thursday - and almost broke into the top 20 daily S&P500 returns in history - since the 1920s. So, what doesit mean?