No. It ought to be "either" paired with "or", or "neither" paired with "nor". It reads better with a little amendment: 'In my opinion, a big company means neither a good company nor a good product.' Alternatively, it could say: 'In my opinion, a big company does not necessarily mean a good company, or a good product.'
However, it is hard to understand the context. A big company is surely just that. They must keep in business by producing a desirable product or suite of products and that, in turn, would lead to growth. I realise I've gone off-topic. 😀
Strictly speaking when there's a negative in the first part of the sentence it's correct to use "nor" in the second, although in practice "or" is often used and is probably acceptable to all but us pedants!
Thanks for your reply. You're probably correct about redundancy in my sentences, but what I can't provide is an explanation of why the teacher's sentence is correct. If you, could provide one, or link one, I would be most grateful
Sorry, margarita; as you'll have gathered I'm no teacher so not great at detailed explanations!
Your friend's positioning of "either" in her sentence is wrong because it should go before "a good company", followed by "or a good product". B Alternative phrasing your friend could have used doesn´t mean a good company either a good product
Sorry again, margarita - I haven't been at the gin, honestly!! Was composing the above post and considering alternative ways of trying to explain myself when the laptop decided to take charge of things and post my disconnected jottings! Will try to figure our what I want to say and revert shortly.
As we're agreed, the position of "either" in your friend's sentence isn't right because although you can use "or" without "either", you can't use "either" without "or". And if we're being sticklers (as the teacher presumably is) the same rules apply for "neither" and "nor" because of the negative word "doesn't".
When you say you didn't follow my last sentence were you referring to my post of 15.57 today? Because that's one that I inadvertently posted when it was far from finished - just jottings, really! I think the teacher's correction is right.