Infrastructure: What's the smartest SDG target?

Clearly, the rapid rollout of broadband services has transformed the lives of people in the industrialized world, and there is every reason to expect that developing countries could benefit at least as much. It would enable a host of new enterprises and all the spillovers that come with it - more jobs, greater efficiency, bigger markets for goods and services, and faster innovation. It would also assist in achieving better outcomes in education, health and poverty reduction. In short, it would deliver a significant boost to GDP. 

As reported by AFP across the world (also in Russian and Indonesian language) and the Wall Street Journal, one of the biggest opportunities is in mobile technologies. Mobile phone use is already spreading rapidly in developing countries, avoiding the need for old-style fixed infrastructure, and data services can use the same system.

One scenario envisions we increase developing countries mobile broadband access from 21% in 2014 to 60% in 2030, bringing 3 billion people online over the next 15 years. Already by 2020, the benefits would be almost half a trillion annually, and these would increase further towards 2030. Over the coming decades the total benefit would reach almost $22 trillion.
 
These eye-catching numbers come at significant cost - $1.3 trillion over 15 years. But it would be money well spent because every dollar invested returns $17 in benefits.

You can read all the papers on infrastructure here and download the one page PDF here.