The Dow Jones Industrial Average is a key barometer of the U.S. stock market. Its 30 component stocks — such as Apple (AAPL) , Boeing (BA) , JPMorgan Chase (JPM) , and Walmart (WMT) — are a narrow ...

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Stock markets can go into sharp declines over a short period of time. For example, President Trump’s directive to implement tariffs in early April 2025 sent the U.S. stock market into a sharp decline ...