Free Shipping versus Discounting

I’m not so sure you can equate these two strategies of customer enticement. It seems to me that discounting is a great means of getting someone to your ecommerce site, but free shipping may be the way to increase conversion rates. I’m also curious how loyal bargain shoppers are. If you steeply discount, do folks some day return and purchase without the discount? If you offer free shipping, isn’t that a feature of your site