[kaybe]

It's not like the population will buy more things if you open one more day though (not sure how online shopping plays into this). So your revenue will just be spread out over more time, and your costs will be higher since you have to keep the shop open one more day. </speculation>

[kaitai]

This is not just speculation. I live in a US state that recently allowed liquor stores to be open on Sundays. Biggest opponent of the law change? Liquor store owners. No increase in revenue, increase in employee and operating costs -- no win for them. That pressure to open if the neighbor shop is open means almost every liquor store is now open on Sundays.