Suppose a tree is on person A's property, but it gives shade to his neighbor, person B. However, A is considering cutting the tree down because its roots are getting into his septic system. Let Va be the value of the tree to B, and let VA-c be its net value to A, where c is the damage to A's septic system. (a) Compare the conditions for it to be privately and socially optimal to cut the tree down. (10) (b) Suggest a solution that will make these conditions coincide