Answer to Question 1
Perfect substitutes are goods for which at any point you will trade one good in the same proportion for the other. The specific utility function is U(x,y) = ax + by, and the ICs are linear throughout.
A corner solution is when the optimal bundle is all of one good and none of the other (i.e. the solution is at the intercept of the BC and one of the axes).
True, since the MRS is constant for p.s.'s, the optimal bundle will occur at a corner
Answer to Question 2
Without checks, the employer (principal) might have the ability of exploiting an employee (agent) by claiming that he/she did not put forth the effort agreed upon, or by falsely reporting information such as profits. Since payments are made after work is completed it potentially puts the employee in a bad bargaining position. An inefficient contract might eliminate/mitigate such behavior.
Average optimal blood pressure for age
Shell-bundle clearance
How to factor a perfect square trinomial
Endangerment sites-anterior and posterior views.
Anterior and lateral views of breast anatomy
Draw an Edgeworth box for two consumers over two goods