Write
a simple short Java program of your choice which illustrates
inheritance, polymorphism and the use of interfaces. The program
should not take up more than half a page of size A4.
The diagram to the right illustrates a competitive market in which the product provides an external benefit. If a voucher equal to $20/unit (i.e., a voucher equal to the marginal external benefit) is given to consumers, then total surplus will A. fall by Area D. B. fall by Area A+B. C. fall by Area B. D. rise by Area C+D. E. rise by Area C + F.