I don't think mobile and social games/apps are clear-cut examples of economies of scale. Accessibility to the cloud and scalable computing resources isn't exclusive to large companies but it may indeed be somewhat cheaper according to size. But even if it is cheaper, it doesn't automatically make mobile and social games more competitive according to the size of their creator's resources. Most economies of scale apply to segments where competitors are all selling equivalent products and can only compete on price or in markets that require extremely expensive infrastructures (billions). Most of the mobile and social games market is defined by small shops climbing to the top of the charts for a short lived but huge shot of revenue. Honestly the whole mobile and social app market strikes me as the furthest thing from an economy of scale IMHO.