The name "Absolut" was introduced in 1879 by the entrepreneur Lars Olsson Smith. Smith introduced fractional distillation that produces liquor without fusel alcohol in Sweden in 1877, under the name "Tiodubbelt Renadt Bränvin" (Tenfold Purified Vodka). Brännvin literally means "burnt wine" and is analogous to the German "Branntwein". The term is also used in Norwegian, Danish and Icelandic. ("Vodka" was not used for Swedish liquor until 1958, with the potato-based Explorer Vodka.) The name was changed to "Absolut Rent Bränvin" (Absolutely Pure Vodka) by Smith to market his much improved product. Smith challenged the city of Stockholm's liquor marketing monopoly with his superior vodka. It was sold at a lower price than the monopoly's product, just outside the city border. Smith even offered free boat rides to the distillery and "Rent Bränvin" made Smith a fortune. In 1917, the alcohol industry in Sweden was monopolized by the Swedish government. Vodka was then sold nationwide under the name "Absolut Rent Brännvin". The name changed with intervals, Renat Brännvin or Absolut Rent Brännvin. In 1979, the old name Absolut was picked up when the upper-price range Absolut Vodka was introduced. "Renat" is still an euphemism for spirits in Sweden.