Market Penetration and Competitive Advantage

Have you guys ever thought about how you are going to market your business? Or what type of competitive edge you will have against any other businesses just like yours? This is a huge decision when it comes to having your own business. Think about Dollar General for instance, it seems like they have one about every 10 miles or so. That is a really good Market Penetration for them, and to think about all the good deals they have along with low prices, that's competitive thinking. If there really was one every 10 miles or so, that would cut out the hassle of having to go too Walmart or somewhere for just a handful of items. Say maybe you just need some milk and bread, it would be so much easier to just go too Dollar General for some than to go too Walmart.