The ecommerce shipping prices that you charge will play a strong role in the sales volumes that your online store generates. Conclusive and ongoing studies have consistently found that there is a direct link between shipping cost and shopping cart abandonment rates. Use this ecommerce shipping infographic to learn how the prices you charge can affect conversions.
Source: http://www.trueship.com/blog/2014/11/25/ecommerce-shipping-and-fulfillment-the-definitive-guide