This means no sales, no themed merchandise, no decorations. December 25 and most other day are treated just like any other day for all stores malls, restaurants, ect.
You’d still get non religious holiday events like mothers days, or independence days.
What whould change?
That would never happen. Those events are too profitable.
I’m not sure you understand the words “what if”
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They would loose a lot of profit. FIFY