Reply To: cheapest_product / every_nth_item query

[Soft79]

It is like this by design for the following reason:

1) Let’s say the customer has 5 products in cart of $100 each. The discount is $100. Cart total is $400

2) Now the customer adds 1 product worth $20. If we use your method and discount the cheapest item, the cart total would become $500.

This means adding a cheap ($20) 6th item increases the cart total with the price of a more expensive product ($100). I.e. the customer would get a worse deal if adding the 6th item. In other words: the customer is penalized for adding more products to the cart.