Yours is the countable case. It can thus take the plural. As the above dictionary mentions: ------ economy (SAVING MONEY) noun [C or U] this means it can be both Countable and Uncountable the intentional saving of money or, less commonly, the saving of time, energy, words, etc: They've had to make economies since Colin lost his job.
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RexThanks nona the brit.They are neither, IMO.
There are people who work for companies as economic/economics assistant.
They are doing bookkeeping, accounting, balance sheet, etc. These people are not directors.
Are they economic assistants or economics assistants?