The Nikkei Average fell last week due to deteriorating conditions in the Middle East and growing concerns over excessive investment in artificial intelligence [1].

This downturn reflects a fragile market sentiment where geopolitical risks and the sustainability of the AI boom are now colliding. Investors are increasingly wary that the massive capital expenditures required for AI may not yield immediate returns, creating a volatile environment for tech-heavy indices.

Market volatility was severe during the period of July 13 to July 17 [2]. At one point, the Nikkei plummeted by more than 1,800 yen, dropping below the 63,000-yen mark [3]. Other reports indicate the index opened with a decline of 147.10 yen at 68,410.63 yen [2], while the closing price was recorded at 62,417.88 yen, down 295.77 yen from the previous Friday [1].

Hiroaki Kawaue of Konzu Asia Capital Limited said the reaction to Alphabet's recent earnings report was a primary driver of the slide. Although the company reported strong results and growth in its cloud business, those successes were overshadowed by the company's financial plans.

"The earnings were very strong, but that actually turned into a decline," Kawaue said. He said Alphabet revised its capital expenditure upward, which increased concerns that the industry is over-investing in AI-related infrastructure [4].

Beyond the tech sector, the index was pressured by escalating tensions in the Middle East. The instability led to a rise in crude oil prices, which triggered a broad wave of risk-aversion selling across the Tokyo Stock Exchange [1, 2]. This combination of high energy costs and tech uncertainty created a double headwind for Japanese equities last week.

“The Nikkei plummeted by more than 1,800 yen, dropping below the 63,000-yen mark.”

The Nikkei's reaction demonstrates a shift in investor psychology regarding the AI trade. While strong earnings were previously a catalyst for growth, the market is now scrutinizing the cost of that growth. When coupled with the external shock of Middle East instability, the Japanese market is showing a heightened sensitivity to both operational costs in the tech sector and global energy price fluctuations.