Which marketing concept is easier to use in thelong run of any business success and why?

[Strange Brew]

I will say the main concept is the notion of building a relationship with your customer. Relationship means that a customer will come back to you when he/she needs the product again. This becomes especially important given that nowadays we have so much of competition in almost every industry. This way you are gradually building a customer base and loyalty. Attracting new customers gets tremendously expensive and hence relationship marketing is the new mantra!