The suitable topic sentence for the paragraph is that countries with high levels of migration are economically successful.
It should be noted that a topic sentence simply means the first sentence of a paragraph that includes the main idea of the story of the literary work.
It should be noted that the research shows that countries with high levels of migration are economically successful and that there is a correlation between a mobile labour force and economic prosperity.
Therefore, the suitable topic sentence for the paragraph is that countries with high levels of migration are economically successful.
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