In Lewis’s dual-sector model, under what condition does the dual economy experience growth?

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When the modern sector's proportion of total output rises compared to the traditional sectorWhen the agricultural sector adopts advanced machineryWhen the agricultural sector employs labor efficientlyWhen the modern manufacturing sector relies heavily on labor

Explanation

According to Lewis’s model, the dual economy expands only if the modern sector's share of output grows relative to the traditional sector. Other factors like mechanization in agriculture or labor intensity in manufacturing do not directly drive overall economic growth in this framework.