Financial markets experienced a dramatic shift in sentiment last week as the conflict in the Middle East escalated beyond initial expectations. Investors who began the week confident that an Israeli-U.S. attack on Iran would be a short, manageable conflict saw their optimism evaporate by Friday. The S&P 500 even posted a slight gain on Monday, reflecting early complacency about the situation.

By week's end, market participants were gripped by fears of a broader regional conflagration that could trigger a global oil price shock reminiscent of the 2022 Russia-Ukraine war. This sudden reversal in market sentiment highlights how quickly geopolitical events can reshape investment landscapes. The prospect of stagflation - stagnant economic growth combined with high inflation - has emerged as a primary concern for investors and policymakers alike.

The market's rapid reassessment underscores the vulnerability of global financial systems to Middle Eastern instability. Unlike the initial reaction that treated the conflict as a localized event, investors now appear to be pricing in the possibility of sustained disruption to energy markets and global supply chains. This shift in market psychology could have lasting implications for asset allocation strategies and central bank policies.