# Professor Ralph Koijen's joint research on variable annuity contract guarantees is featured

1 Faculty News January 9, 2018 ![ThinkAdvisor logo ](/sites/default/files/styles/246w/public/assets/images/thinkadvisor-logo.jpg?itok=Bd2YxL1I)>

Excerpt from [ThinkAdvisor](http://www.thinkadvisor.com/2018/01/09/5-peeks-at-a-hot-new-variable-annuity-guarantee-pa) -- "The researchers — [Ralph S.J. Koijen](http://www.stern.nyu.edu/faculty/bio/ralph-koijen), an economist who teaches at New York University's Stern School of Business, and Motohiro Yogo, an economist at Princeton University — wrote the paper to fill what they see as a major gap in the economic literature: a lack of research on variable annuity contract guarantees."

[Read more](http://www.thinkadvisor.com/2018/01/09/5-peeks-at-a-hot-new-variable-annuity-guarantee-pa)