Stock market today: Dow, S&P 500, Nasdaq pull back as AI worries sap markets ahead of Nvidia earnings

Group 1 - US stocks retreated due to concerns about an AI bubble and the broader US economy, with the Dow Jones Industrial Average falling nearly 0.8% and the Nasdaq Composite pulling back roughly 0.5% [1] - Bitcoin dipped below $90,000 for the first time in seven months, leading to significant sell-offs and impacting Japanese stocks, which experienced their worst loss since April [2] - Nvidia's third quarter results are anticipated, as investors reassess the sustainability of the AI-driven market rally amid increased Big Tech debt issuance [3] Group 2 - The upcoming September jobs report is expected to influence expectations for the Federal Reserve's policy moves, following a delay in official data releases due to a US shutdown [4] - ADP data indicated a slowdown in job losses in the private sector, while earnings reports from retailers like Home Depot, Walmart, and Target are expected to provide insights into consumer strength ahead of the holiday season [5]