If a Structural Model Has M Simultaneous Equations,what Is the Necessary

Multiple Choice

If a structural model has M simultaneous equations,what is the necessary condition for a unique parameter value to be consistently estimated for each variable in the equation?

A) The number of endogenous variables excluded from the equation must be at least as large as M-1
B) the number of endogenous variables excluded must be at least M/2
C) the number of exogenous variables in the equation must be greater than the number of endogenous variables in the equation
D) the sample size must be large enough to allow M * (M-1) degrees of freedom