Negotiating an offer, is it too late? - 7 months and counting

I received an offer as a retail manager and I think the pay is a little low. This is my first time dealing with any of this. I have a competing interview next week. Did it backfire?

I thanked them and said I was excited but hoped we could talk about the pay. They came back with a bit more.

Ask about the range, not a number on its own. It felt more collaborative.