Final answer:
The full employment zone of the Keynesian long-run aggregate supply curve is the horizontal portion where the economy operates at potential GDP with low unemployment.
Explanation:
The full employment zone of the Keynesian long-run aggregate supply curve is the horizontal portion. In this zone, the economy is operating at its potential GDP, where all available labor and machinery are fully employed, leading to a relatively low unemployment rate. Potential GDP in this zone is also termed as full-employment GDP.
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