Why is word of mouth sustainable?

•WOM connects businesses with customers and creates a sustainable ecosystem for businesses and their customers by helping businesses to reduce their marketing costs and by helping customers to reduce their bills. Wom helps build life time relationship for businesses and customers. 




•Elasticity of WOM is much higher than any other form of marketing. 

•WOM gives rise to more WOM (just like manure gives rise to plants and goes back into the soil)

If there was no other form of marketing done by businesses, WOM would still exist, it is natural and hence sustainable.