1) NIT-jobs program , what is it?

2) Income -maximizing strategy , what is ti ? how to apply it in economics?

3) A positional arms race is a series of mutually offsetting investments in performance enhancement that is stimulated by a positional externality.

A positional arms control agreement attempts to limit the mutually offsetting investments in performance enhancements by contestants

What Is this positional arms race? what is the positional arms control agreement? may you explain step by step and give examples. What does the positional externality mean?

4) What is the difference between taxation and regulation in economics ? which one is more effective?

5) What is the social efficient level and the difference between the social optimum level?

Is it because the social efficient level have MSB=MSC ? and the social optimum level MPB=MSC?