This article by Business Insider, from 2019, states that "[the Obamas are] worth 30 times more than when they entered the White House in 2008".
Is it true? Is it normal?
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Wikipedia puts Obama's peak net worth at 40 million, using 2016 U.S. dollars.
Wikipedia references A 2017 article in al.com that claims that
Obama's net worth, according to GoBankingRates.com, is about $12.2 million. First Lady Michelle Obama's net worth is about $11.8 million.
Here is a quote about the finances of Barack Obama from an 2020 Fact Check article discussing a rumor about their finances:
For Barack and Michelle Obama, $15.6 million of the $20.5 million that they earned between 2005 and 2016 came from books written by the former president, according to a 2017 Forbes analysis. Two of the books, “The Audacity of Hope” and “Dreams from My Father,” were published before he became president, and a third book for children was published in 2010. Just over $3 million came from the presidential salary for eight years.
Since leaving the White House, Barack and Michelle Obama have signed onto high-profile deals, including one reportedly worth $60 million for a pair of memoirs. The first, written by Michelle Obama, was released in November 2018 and became the best-selling book that year. The couple also signed a television series and movie production deal with Netflix, but the amount they’ll make from it isn’t clear. One early report described it as a “high 8-figure deal.”