Developing nations have no shortage of quirks. For example, they can impose tariffs on the import of the equipment needed for domestic lighting while still hav

Developing nations have no shortage of quirks. For example, they can impose tariffs on the import of the equipment needed for domestic lighting while still having a lot of GDP generated by oil. That does funny things to the analysis. Then there was the problem of how you uncover the sub-national GDP to ground-truth your data showing sub-national variations in light levels.