Consider the market for pens. suppose that the number of students with an allergy to pencil erasers increases, causing more students to switch from pencils to pens in school. moreover, the price of plastic, an important input in pen production, has dropped considerably.

These two events will have an effect on the equilibrium quantities of the market for pens. The equilibrium quantities will increase explicitly While the price change will also increase given that the number of pens demanded increase and the cost of pens dropping.

d. to get countries or companies to stop doing something objectionable.

answer; (inseparability);