Group 1 - The core viewpoint of the article indicates that the U.S. stock market experienced a rebound last Friday, recovering most of the week's significant losses, but is expected to face additional selling pressure from trend-following algorithmic funds this week [1] - Goldman Sachs predicts that regardless of market direction, systematic strategies that track market trends rather than fundamentals will continue to maintain net selling in the upcoming week [1] - If the stock market declines again, it could trigger approximately $33 billion in selling this week, and if the S&P 500 index falls below 6707 points, there may be up to $80 billion in systematic selling over the next month [1] Group 2 - In a stable market scenario, it is anticipated that CTAs will sell about $15.4 billion in U.S. stocks this week, and even if the market rises, these funds are expected to sell approximately $8.7 billion [1]