A typical concave production possibilities curve implies:Multiple Choicethat economic resources are scarce.that society must choose among various attainable combinations of goods.all of these are correct.increasing opportunity costs.

The correct answer is "all of these are correct."

Here's why:

1. A typical concave production possibilities curve implies that economic resources are scarce. This is because the curve represents all possible combinations of two goods that can be produced given the available resources. If resources were not scarce, the curve would be a straight line extending indefinitely.

2. The curve also implies that society must choose among various attainable combinations of goods. This is because not all combinations are possible due to the scarcity of resources. The points on the curve represent the maximum possible production of one good for a given level of production of the other, given the resource constraints.

3. Lastly, the curve implies increasing opportunity costs. This is because the concave shape of the curve reflects the law of increasing opportunity costs, which states that as more of a good is produced, the opportunity cost (in terms of the other good) increases. This is due to the fact that resources are not perfectly adaptable to the production of all goods.