Because Walmart is too cheap to open an adequate number of registers. They have around 15-20, but I think the ones in the middle are just holograms.
One of the cashiers told me they are going by some internal standard and they're satisfied with minimal staff, since the next closest store is so far away
That depends on the day and time. Between noon and 6 pm you will usually find almost every register open. Especially on weekends.
Because there are mean customer that do nothing but complain
Yes they are depending on when you go
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