Why is... Une diminution des prix serait positive....is correct? And why ....Une diminution de prix serait positive.... is incorrect. I would think that later should be correct because clearly "de' is all about Une diminution. Why are we using plural here?
Also confused. A diminution or a reduction- both are still singular when used as nouns so why the plural "prices"? It implies a knowledge of what is being traded which isn't given in the text or either should be accepted as grammatical, surely?