I consider if people want to undercut me on price, let them go ahead. I don't want cheapskate customers, and they can find out just how little money they can make doing that.
My biggest problem is me and my own inefficiency. I have been doing this for over ten years and am only now working out systems that make producing products and getting out orders more efficient. I think it took me seven years before I put my stock in alphabetical order, for instance.