The study of heuristics in human decision-making was developed in the 1970s and 80s by Israeli psychologists Amos Tversky and Daniel Kahneman, although the concept was originally introduced by Nobel laureate Herbert A. Simon.
Christina Aguilera is an American singer-songwriter, record producer and actress who has an estimated net worth of $100 million and an annual salary of $130 million.She is sometimes called by the names Chrissy, X-Tina, Baby Jane, and Candy who is best known for her vocal power and provocative personal style.er breakthrough hit was the single Genie in a Bottle. Christina Aguilera had her follow-up studio albums Stripped (2002) and Back to Basics (2006). She then expressed that she wanted a much bigger control over her music so she intentionally fostered a. more adult image.
$140 Million. Rihanna net worth: Rihanna is a Barbados-born singer, songwriter and actress who has a net worth of $140 million.Rihanna, who was born Robyn Rihanna Fenty, earned her net worth as one of the most popular and commercially successful music artists in the world today.Rihanna used singing as a way to cope with the turmoil of a rocky family life.n the advice of her then record producer, Rihanna moved to the United States at age sixteen to pursue a career as a singer/songwriter. After her demo was heard by former rapper Sean Carter, aka Jay-Z, and then CEO of Def Jam Records, Rihanna was invited to audition for him and immediately signed.