question: Why did Palermo substancially grow in size ?
answer: reduced importance of agriculture in the Sicilian economy has led to a massive migration to the cities
turker_answer: Palermo substancially grew in size because of the reduced importance of agriculture in the Sicilian economy which led to a massive migration to the cities .
rule-based: Palermo substancially grew in size because reduced importance of agriculture in the Sicilian economy has led to a massive migration to the cities .