Kau and Sirmans, in an article in the [Southern Economic Journal] (October 1976), state that return, repeat, and new migrants may behave differently in making their migration decisions; therefore, specification bias may result if these three "migrant types" are indiscriminately combined. This comment on the article points out that Kau and Sirmans fail to show why and how these groups behave differently, and that the empirical work suffers from a number of flaws.
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