The 'Oprah Effect' on book sales
Prior to Oprah Winfrey's selection: 11 of 45 books made USA Today's top 150 best-seller list the highest reaching 25th.
After Oprah's selection: First 11 books selected all unranked the previous week rocketed immediately into the top four.
Oprah-selected books generally averaged longer stays on best-seller list than other books.
Oprah-endorsed books that later made paperback best-seller lists averaged 6.5 weeks in top 25.



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