Although the US launched an attack on Iran's nuclear facilities, the sell-offs wrought by geopolitical events were brief, Morgan Stanley analyst Michael Wilson suggested.Brent crude oil futures grew 5.7% at one point on Monday (23rd) but has since reverted down, last trading at US$76.75 per barrel, down 0.34%.Related NewsM Stanley: CN Brokers Receive Multiple Positive News; Financial System's Return to Prudent Development Benefits Capital Mkt; HK Expected to Benefit FirstHistorically, most sell-offs triggered by geopolitical events are brief and moderate, and the trend in oil prices will determine whether market volatility persists. Currently, several favorable factors, such as a waning US dollar and a rebound in corporate earnings growth, are supporting the US bourse. However, if oil prices continue to rise, stock investors may become nervous, as rising oil prices could have an immense impact on inflation and the economy, threatening the path of interest rate cuts.Related NewsHSBC Research: HKEX May Face Greater Competition as CN A-Shr Listings AccelerateWilson accentuated that oil prices must spike to create a bearish market scenario, believing that oil prices would need to reach US$120 per barrel to pose a threat to the business cycle.