The Derivational Fallacy
Etymology is not destiny, as we keep pointing out here. Thinking that it is is subscribing to the Etymological Fallacy (see here, among many other places). But even synchronically, you can't always trust what you see: derived lexical items are often specialized semantically (as are noun-noun compounds and also combinations of non-predicating adjective plus noun). This is especially true of technical terms; as I am fond of saying: labels are not definitions.
Which brings us to financial derivatives. Derivative here is derived from derive, right? So we can tell what it means in this expression from its morphological composition, right? Well, no. But people want that to be true.
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