If the marginal total cost when moving from Option A to Option B is negative and the marginal total cost when moving from Option B to Option A is positive,which of the two options is better? What is the underlying principle behind the decision?

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The Answer of If the marginal total cost when moving from Option A to Option B is negative and the marginal total cost when moving from Option B to Option A is positive,which of the two options is better? What is the underlying principle behind the decision?

If the Marginal Total Cost When Moving from Option a to Option