The combination of goods which are beyond the boundary line of the PPC is often regarded as which of the following?

Unattainable combination

All the points on the PPC or below PPC are called unattainable combinations, whereas, the ones which are beyond the line are unattainable combinations. They are unattainable because the resources and technology required for the production of the same are not sufficient in the economy. These can only be achieved if there is a shift in PPC due to increase in resources of the economy or technology.