True story: many years ago, at least 20, I got a call from a client who I had never worked with and who was looking for a stock photo. At the time I was in Portland Oregon and known as a local stock photographer with a large library of images.
This client requested a selection of images for which I do not recall just what the subject was, but we sent a selection over and sometime thereafter she called to negotiate a price.
After describing her usage I did as I always do: told her I would call her back. This is an important strategy because it gives you time to think about the usage for it the specific market instead of having to name a price immediately while on the phone.