Nope, I was not arguing about my own previous point. In the first one, I replied to the idea that Carrefour is overcharging for food, and that then nothing prevents producers from selling their own products at a cheaper price. They can start small and setup their own distribution.
My second point was to reply to another idea floating around, that "if a new competitor enters the market, Carrefour will slash their prices to kill them off". Then, the small producer has the choice to differentiate if they cannot fight on price.
By the way, since I'm French, I may as well remind you that in every small town and big city of France, there are still weekly markets where local producers come and sell their products, very often for a higher (and not just a little higher) price than what you would pay in Carrefour or other supermarkets. And guess what ? Some people STILL buy their food there. Not everyone, but quite a lot do. So, there's nothing preposterous about the idea I was proposing, because there's clear precedent, even in the current market situation. Some people will always be paying to pay more for "quality", "traceability" and direct-relationship of trust between the buyer and the seller.
Now, for most people (not the ones I just mentioned), you also have to realise that Food has become a commodity, and therefore for those people, they are not going to be interested in paying more, they simply want to get their food as cheap as they can, so they can spend their money somewhere else (ipad, new tv, vacations, etc...).
It's all about knowing your consumers in the end, and finding out how you can better serve (some of) them.
Coming back to the discussion, the competitors of Google Maps should be thinking of how they can provide more value to users than the "free" Google Maps. By the way, in other markets, like video games, some online services like Steam have no problem fighting against free offers (i.e. piracy) just because they provide more convenience to the end users. They get it, and they don't bitch about piracy or whoever else killing their business.
When you start pointing fingers around, it's usually your product/offer/service is simply not good enough, or nobody cares about it.