What caused Japan's stock market to tumble? 3 theories

The Nikkei average took a plunge, causing global jitters

Japan stock
(Image credit: AP Photo/Shizuo Kambayashi)

After months of soaring prices, Japan's Nikkei stock index plunged 7.32 percent on Thursday, the largest one-day drop since the country's 2011 tsunami and nuclear disaster. All 225 companies on the index saw their share prices fall, with some, such as Mitsubishi, slipping double digits.

It was a such a dramatic dive that jitters quickly spread to markets in Australia, Hong Kong, and South Korea, before hopping to Europe, where stocks in London, Paris, and Frankfurt dropped more than two percent. This morning, U.S. markets dipped in early trading, before eventually recovering.

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Carmel Lobello is the business editor at TheWeek.com. Previously, she was an editor at DeathandTaxesMag.com.