Excerpt from the article by Roger Williamson:
I recently asked esteemed economists Finn Tarp and Tony Addison of UNU-WIDER (the UN University World Institute for Development Economics Research) what sort of data they think are needed for a data revolution in development. Their answer was more prosaic than the ‘magic’ of big data.
Properly collected data, for example through regular household surveys, provided the material needed to check what happened to poor households in Vietnam during the switch to a market economy.
As Tarp points out, despite the country growing rapidly, many households initially became poorer. I cannot see how that would be picked up from mobile phone data, for instance.