This is nothing more than a slider that calculates unit price in between standard price breaks. How exactly is this ground-breaking?
In reference to the patent: US7979318
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To be granted a patent has to be novel and non-obvious over the prior art at the time of filing. It does not have to be ground-breaking, ingenuous, the next world wonder or even commercially viable. That's simply no requierement for a patent.
In 1997 a mother of three filed a patent for online shopping carts which was auctioned of for 2.5 million pounds in London ~10 years afterwards. Retrospectively, that seems like a pretty obvious invention. Nevertheless, nobody had thought of it or if they did, nobody published it.
An invention does not have to be ground-breaking to become a strong patent.