To resolve this paradox, we need to reconcile the Economist's rule (money's value comes from scarcity) with the Anthropologist's observation (cowrie shells were used as money despite being "unlimited" on the beaches).
The Paradox
The Rule: Money must be scarce to have value.
The Counter-Example: The Kwara'ae used cowrie shells as money, yet these shells washed up in "unlimited numbers."
Option Analysis
A) During festivals they exchanged strings of cowrie-shell money...
This describes a ritual use of the money but doesn't explain how the shells maintained value despite being abundant. It doesn't address the "scarcity" issue.
B) They considered porpoise teeth valuable...
The value of porpoise teeth is irrelevant to explaining how cowrie shells functioned as a scarce currency.
C) The shells used as money by men were not always from the same species...
This adds a detail about gender roles but doesn't solve the core problem. Even if the species differed, the prompt implies shells (in general) were unlimited on the beaches.
D) They accepted as money only cowrie shells that were polished and carved by a neighbouring people...
Correct. This perfectly resolves the conflict. While "raw" shells on the beach were unlimited, the "money" shells required skilled labor and time from a third party. This process introduces perceived and real scarcity, fitting the Economist's criteria.
E) After Western traders brought money... cowrie-shell money continued to be used.
This shows the currency was durable and persistent, but it still doesn't explain why it had value in the first place if the supply was unlimited.
Correct Answer: D