So who do you think your competitors are in your market, I am guessing that the answer you just gave is not who your actual competitors are.
Let me explain a little, you probably said that your competitors are the other people in your area who are selling the same thing as you, or the website that sells the same thing as you.
However when you are talking about on-line marketing this is not who your competitors are, your competitors are any website that ranks higher than you in the search engines for the terms that you need to rank for.
So it is possible that you are in competition with wikipedia and ebay, this is because to get your website and your products in front of your potential clients you need to be at the top of the search engines for the most relevant keywords.
How do you do this you may be asking, well the secret is good Search Engine Optimisation (SEO) if you use good search engine optimisation and keyword research you can plan your march up the search engines and you can ensure that you are able to outrank your true competition at the top of the search engine rankings.