Question: Consider the following simultaneous equation model:
Y1t = A1 + A2Y2t + A3Y3t + u1t
Y2t = B1 + B2Y2t + A3Y3t + u2t
In this model the Ys are the endogenous variables and the Xs are the exogenous variables and the us are stochastic error terms.
(a) Obtain the reduced form regressions.
(b) Which of the above equations is identified?
(c) For the identified equation, which method will you use to obtain the structural coefficients?
(d) Suppose it is known a priori that A3 is zero. Will this change your answer to the preceding questions? Why?