Read more:
https://www.marketingprofs.com/charts/2010/3542/shoppers-seek-coupons-and-free-shipping-offers#ixzz28gf7i57W
In addition, read the article below on the importance of "free" in online commerce:
https://www.marketingprofs.com/short-articles/2555/the-importance-of-free#ixzz28gdt7f4u
Based on these articles and other readings you may find, what do you think of the "free" offers used by online retailers or marketer?
Do you think the "free" offers would be more effective than coupons?