In a recent post on the app localization opportunity we highlighted the potential for targeting growth markets in the emerging world. Not all apps are equally suited to doing so though. For some high-profile apps such as Facebook, Google Maps or Angry Birds the demand is global and these apps easily penetrate local markets. For other apps — like a taxi booking, cinema schedules or restaurant reservation apps — what works with US consumers will not work in the local business environment or culture in a European or Asian city. Different language, culture, business environment, promotional channels, regulations, brands and local consumer behaviour will mean that many apps will need adaptation to penetrate local markets. It also means that much local app demand is currently undersupplied. China, Brazil and Russia are good examples of major markets that are hard to penetrate, yet present major opportunities for mobile app developers globally. We believe that in the app economy, global demand for top-seller apps will dominate downloads in most regions. At the same time, regional demand for localised apps will drive the production of the next 10 million apps.