Buying anything above, say, 100€? Smile, say 'discount?' and they will through in something for free or give a few percent off.
And that's before any kind of negotiation (unless you count asking nicely as negotiation). And I mean anything. I've done it in many places. Is there anywhere where that does not work?
can you expand on the "anything"? I'm having doubts that I can negotiate the price of eg. a TV bought in a hypermarket (Walmart, to give a US example) ?
Hm, I haven't tried that yet, but I think it is possible. It usually works very well in specialized and non-chain stores.
If you cannot find a salesperson with any decision power it might be harder.
You can try asking the next time you buy something big. The worst that can happen is them saying no, if you really asked nicely.
PS: I dented a rental car and got a huge bill. I called them up and basically said 'discount please?' They gave me a 20% discount, and that was without any kind of arguing or confrontational talk, just the question. So it's not just for stores.
And that's before any kind of negotiation (unless you count asking nicely as negotiation). And I mean anything. I've done it in many places. Is there anywhere where that does not work?