The Expectation of Free Shipping
Free Shipping Isn’t Really Free - The Atlantic
In a 2018 survey by Internet Retailer, shipping charges were cited as the most common reason shoppers abandon their carts, topping the pet-peeve list for nearly a third of respondents, ahead of things like not wanting to create an account and being unsure of the store’s return policy.
In general, Dhar says, shoppers are even willing to pay more overall for the same goods if there isn’t a separate shipping charge.
This article is full of good stuff, and I definitely found myself nodding along, thinking “yeah, I would totally rather buy $10 more to get something I don't need than pay $5 for shipping.” It's not rational, but it definitely resonates.