Why are there no women on the Forbes list of highest paid athletes?

Available for over a year

Forbes has published a list of the top 100 earning sports stars around the world, and for the first time it doesn't include any women. Serena Williams, who featured last year doesn't make it in 2018 because she took time out to have a baby. What impact does this pay gap have on women's sport in general? Sports writer and Chair of Women in Football Anna Kessel, and boxer Tasha Jonas join Jenni Murray on Woman's Hour.