Can I ask how they did the research to establish that being open longer would generate extra business and not just shift it? And what types of retailers were/are they?
The thinking with supermarkets is perhaps a lot different to, say, a DIY store that loses sales if it can't be open extra early on a Sunday when someone wants to do some home improvement work - but opening earlier would mean losing sales later on.
Or maybe click and collect sales go down because there aren't enough slots.
I'm genuinely interested.
In broad terms of course people will eat roughly the same as they do today.
However, at least one consideration has to be convenience for the consumer, not just for the retailer. In the days when supermarkets weren't open Sundays, past mid afternoon on a Saturday, past 5pm weekdays bar one evening of late night opening, and closed for a midweek day or half day, the world was very different. In addition to virtually all adults working rather than just half as examples there are plenty of sporting events on a Sunday, pubs are open on Sunday afternoons, and those two examples reflect many other leisure activities on a Sunday that never used to be the case.
Now, the likes of Deliveroo, Just Eat, Uber Eat, plus the likes of Ocado and Amazon delivering food show that there are more convenient alternatives, and the likes of Tesco and Sainsbury opening smaller shops just under the regulation size and as a result opening much longer hours on a Sunday also shows a demand there. Tesco have over 2,000 Tesco Express shops, Sainsbury over 800 Sainsbury Local shops.