每日钉一下（市场大跌时清仓，这种做法对吗？）

Group 1 - The article emphasizes the importance of investing in index funds, particularly during market downturns, advocating for a contrarian approach where investors buy more when prices are low and sell when prices are high [7][8]. - It highlights the psychological tendencies of investors, noting that many tend to sell during market dips out of fear, which can lead to missed opportunities for gains during subsequent recoveries [7][9]. - The article suggests that index funds do not require stop-loss strategies due to their long-term growth potential, and encourages a strategy of dollar-cost averaging during bear markets to minimize losses [8][9][10].