Market Research Reports, Inc. has announced the addition of “The Economics of Mobile Ad Spend 2013 - 2016: Global Inventory, Media Billings and Business Operations” research report to their offering. For more information visit: http://www.marketresearchreports.com/accustream-research/economics-mobile-ad-spend-2013-%E2%80%93-2016-global-inventory-media-billings-and