These points are attainable (e.g., point U), but they are not using the resources at the fullest. At point U, if technology or resources are used at full capacity, the economy could be at point B or C, meaning more would be produced. All points outside PPF are unattainable (e.g., point Z).

Which points are attainable and efficient?

What we can produce given the resources that we have. On and under the PPF line is attainable. Points A, B, and C are efficient and attainable. Point X is inefficient but attainable.

What are attainable and unattainable combinations?

In Economical terms, an attainable combination is the set or combination of two goods which is feasible by the economy to manufacture with the available resource allocation and technology. ... Points on the right on outside the curve represents the unattainable combination of goods.