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Explanation: I must confess that I don't know the word "collective". Neither does it appear in my dictionary as a noun.
In all cases, there should be an "s" at the end of it or no "s" at the end of "nationales".
Explanation: "collective" is not a French noun but a feminine adjective. The phrase is meaningless in French unless you read it as "collectifs nationaux" or "collectif national". a "collectif" is an interim budget.