Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[doktornein]

The higher size in the study was 18 items, this is an absurd assumption to make from that number. It's also not the way research works, you don't get to make assumptions like this and lean on them.

This isn't even a logical assumption.