Question : Bearing in mind the assertion that economics is a "positive" and not a "normative" science, with which of the following problems would an economist be concerned?

I. The unfairness of the distribution of wealth
II. The effect on prices due to speculation in raw materials
III. The results of union pressure for increased wages
IV. The rights and wrongs of exaggerated advertising claims

Option 1: I only

Option 2: II, III

Option 3: I, III

Option 4: I, II, III, IV