Meghan Messenger of NextJump said marketers who want to devise mobile location-based programs at retail must market to women as 90% of all shopping is done by woman. She said, further, that if marketers focused only on women in New York City they would reach a sufficiently large audience of smart-phone enabled shoppers. "In our work with Master Card we have found that the most important markets are the U.S., Brazil, and the third "country" is New York City. But women are not using mobile to help themselves shop."