Key Facts
—The trigger. A single doubt about whether AI chip demand can match sky-high valuations spread across the world’s markets in one trading day.
—Seoul. South Korea’s main index fell 9.99% and tripped a circuit breaker, because two chipmakers make up almost half its value.
—Amsterdam. The Dutch market wobbled mainly because one company, the chip-tool maker ASML, dominates it. ASML fell about 5%.
—New York. America’s tech index had its worst day in about two weeks, but the damage was spread across many firms, not concentrated in two.
