Feenstra, Advanced International Trade 9-26 Notice the obvious difference between the politically optimal tariffs in (9. Also, the return value of the function will be of type double as indicated at the tail end of the function header: Procedures 89 Team-LRNPublic Function BlackScholesCall(ByVal dblStock As Double, _ ByVal dblStrike As Double, _ ByVal dblTime As Double, _ ByVal dblInterestRate As Double, _ ByVal dblSigma As Double) _ As Double The function definition exists between the header and the footer, End Function. If only this were true .