PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28 
objectives it is designed to serve, and the objectives are likely 
to be modified in the light of calculations made with the model. 
Again, the policy is bound to be affected by the structure of 
the existing control mechanism, while this is likely to be mo- 
dified in the interests of the policy. And so on. In the next 
chapter we shall examine these connections in greater detail. 
+] Stone - pag. 6