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Read the WSJ article “Apple Still Wears the Market Crown. It Can Easily Slip

1. Write one short 5-line paragraph SUMMARY of the article
2. Then a second 5-line paragraph describing the lecture topic the article relates to
3. And in the second paragraph state lessons learned

On Aug. 31, Exxon Mobil Corp. XOM 0.64% was booted from the Dow Jones Industrial Average. That should serve as a warning about the technology stocks that, at least until Thursday’s shocking 5% decline, have been the market’s darlings. As recently as 2011, Exxon had the biggest market capitalization of any company in the world. It had been the longest-tenured company in the Dow, having entered the index in October 1928. What’s more, as long ago as 1912 Exxon (then known as Standard Oil Co. of New Jersey) had been the world’s second-largest stock, surpassed in market value only by U.S. Steel. X -1.35% If such a durable titan can fall away, so can the tech stocks that so many investors have come to regard as invincible. Exxon had been one of the five biggest U.S. stocks by market value in every decade from the 1930s to the 2010s, according to Dimensional Fund Advisors, an investment-management firm based in Austin, Texas. Now it isn’t even among the top 30. It is hard to stay on top, but it’s even harder to get there. Of the 24,979 companies (including real-estate investment trusts) that issued common stock between December 1925 and July 2020, only 11 have ever ranked number one by market value. That’s according to the Center for Research in Security Prices LLC, a data and index provider affiliated with the University of Chicago Booth School of Business. AT&T Corp. was the largest stock in the U.S. 43% of the time over that nearly 95-year period. In the early 1930s, it alone accounted for one-eighth of the value of the entire U.S. stock market. As recently as the 1960s it was still one-twelfth of total U.S. market value all by itself. International Business Machines Corp. was no. 1 in market value among all stocks 20% of the time, and General Electric Co. and Exxon each ranked number one on 10% of all trading days. In decades past, General Motors Corp. —nowadays no longer even among the 150 largest stocks—was often king, ranking number one more than 6% of the time.Then there were the companies whose reign at the top lasted only a few days. Altria Group Inc., formerly Philip Morris Cos. Inc., was the biggest stock in the U.S. for 34 days in 1991 and 1992; E.I. DuPont de Nemours & Co., for 11 days in 1955; and Walmart Inc. for a grand total of three days in 1992. Some of Exxon’s shrinkage is its own doing. Years ago, the company embarked on one of the biggest share-repurchase programs in history. Exxon bought back 2.3 billion shares—more than one third of its total common stock—from 2004 through 2020. The company spent $231.4 billion on these buybacks, according to S&P Dow Jones Indices analyst Howard Silverblatt.