GPS data indicates economic gap between crowds attending presidential inauguration and women's march

Using anonymised data GPS data from mobile devices, primarily smart phones, SafeGraph concluded that the crowds attending the US presidential inauguration in January 2016 make significantly less money than attendees of the Women's March two months later. The income level estimates were made possible by merging SafeGraph's movement data with census data, which is organised by US postal zip codes. Identifying the zip code in which a phone spends most of its time enabled Safe Graph to show that visitors from the Northeast region made up a significantly larger fraction of the Women's March crowd than the Inauguration crowd and compare the median household incomes for the states represented. SafeGraph was also able to identify the two crowds' favourite sources of drinks and food. There was no significant difference: everyone likes Starbucks and Shake Shack.