The answer is yes for many people. If you have a relatively well known product in your niche, people are going to know when you start changing the price. You

The answer is yes for many people. If you have a relatively well known product in your niche, people are going to know when you start changing the price. You have to do it on the quiet, because changing the pricing without any associated 'special offers' is the only way to know for sure. I've always wondered if I am in the right part of the price/demand curve, but it is so very hard to tell, and doing experiments like this seem to involve risk of alienating your customer base, particularly if you do a lot of repeat business with the same people.