When one or both countries forbid multiple citizenships, the results change considerably.

People are most likely to emigrate, when both the origin country and the destination country allow them to take more than one citizenship. They are least likely to leave their home country when both forbid it. Moving to a multiple-citizenship-forbidding country is more likely than away from one, according to the research.

For the country looking to attract talented workers, allowing dual citizenship is clearly a place to start.

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