Each of the following is an example of a permanent fixed supply except:
a. prehistoric pottery
b. a 1969 mustang convertible
c. a copy of the declaration of independance
d. poems written by shakespeare

All of the choices are examples of a permanent fixed supply except (B) a 1969 Mustang convertible. Permanent fixed supply here refers to supplies that are already fixed and cannot be modified in the course of time. It is already historic and no other people can modify it like a prehistoric pottery, a copy of the Declaration of Independance  and poems written by Shakespeare

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