This small business had a 1,371% increase in Amazon sales on Prime Day—and it’s not even over yet

That offer was 20 percent off six packs of assorted gums on Prime Day, which usually sell for $15.99 on Amazon. Simply Gum is also offering 20 percent off of the brand’s new mints for the rest of Prime week. To prepare for the sale, founder Caron Proschan...