run simulations using the HBS platform for the case $$Digital Marketing Simulation: Media Attribution at ExerciseMinder.$$ Acting as the chief marketing officer $($CMO$)$ for an exercise fitness app, ExerciseMinder, students are tasked to increase the installed base by $200\%$ over the next five years and maintain return on marketing investment $($ROMI$)$ at $2\mathrm{.}5$ or higher.