Arnold Schwarzenegger, the movie star-turned-California governor, has been interested in business since long before he was Conan or the Terminator. For more than four decades, his behind-the-scenes partner has been Paul Wachter, whose Main Street Advisors was born 25 years ago, with Schwarzenegger's encouragement.The modern multihyphenate -- think LeBron, Drake, Billie Eilish -- are following a template the pair established in the 1980s, as Schwarzenegger successfully expanded his popularity and wealth through savvy dealmaking. The key element: Don't just endorse when you can own a piece of the product. See omnystudio.com/listener for privacy information.

 Bloomberg Radio host Barry Ritholtz speaks with Adam Parker, who is the founder and CEO of Trivariate Research LP. From 2010 to early 2017, Adam was the chief US equity strategist and director of global quantitative research at Morgan Stanley, where he was acknowledged as a top strategist and quantitative researcher multiple times by Institutional Investor magazine. He was also a member of Morgan Stanley’s Global Investment Committee, a seven-person group responsible for asset allocation recommendations for the firm’s $2 trillion private wealth network. A prolific researcher, Parker co-authored a groundbreaking paper on gender diversity as a risk factor. He holds a Ph.D. in statistics from Boston University.  See omnystudio.com/listener for privacy information.