Jan 16, 2018. Martin Luther King Jr. Day: On this holiday, retailers run sales to attract shoppers who. [See: 12 Shopping Tricks to Keep You Under Budget.]. underpinning a rise in the dollar as investors fretted about the deepening rift between Italy and the European Commission ove. President Donald Trump’s latest round of tariffs have kicked in at 10 percent and are set to rise to 25 percent at the…