Classical liberalism is a type of liberalism. It is a belief in economics and politics. Classical liberals believe in a small government, and believe that people will be ruled mostly by natural law. They believe in unalienable rights. They also believe in a free market and property rights. In the 18th and 19th century, people who believed and wrote about classical liberalism included Adam Smith, Thomas Malthus and Thomas Jefferson. More recently, the economist Milton Friedman was in favor. Many of the beliefs of classical liberalism are now called libertarianism.