On a bowed production possibilities frontier, as you move down along the curve a. more of one good must be given up to receive one unit of the other good. b. the available production technology does not change. c. the opportunity cost increases. d. all of the above are correct.

The correct answer is option d.  

Explanation:

A production possibility frontier shows a different combination of two goods that can be produced using all the available resources and level of technology.

As the production of one good is increased the opportunity cost of giving up its alternative goes on increasing. In other words, as we go on increasing production of one good we need to give up more of the other because of the scarcity of resources.

answer: a. the kind of population living in your neighbourhood.

the census explorer data tool by the us census bureau allows the user to zoom in on any neighbourhood within the united states and find the kind of people residing in that by race and age.  

the tool needs to needs to be used twice – once in order to find what type of people reside in a neighbourhood, and then to see the age groups of the people in the same neighbourhood.