How damaging is the Sunni/Shia split to the economies of Islamic countries? Is it better to be one or the other? Or is it better to have an even balance between the two? Answering these questions is complicated by the fact that the data are often missing or imprecisely measured. We employ the...

We re-examine Lynn and Vanhanen's argument that gross domestic product (GDP) depends upon IQ. We argue that their analysis suffers from three types of biases, each of which would tend to erroneously favor their hypothesis. Despite this stacked deck, we find that their results are rather fragile....