The ideology which states that each person is the best judge of what is in his self interest is

The ideology that states that each person is the best judge of what is in his or her self-interest is called liberalism. This means that individuals should have the freedom to make their own decisions about what is best for themselves, without interference from the government or other outside forces. Liberalism places a high value on individual rights, such as freedom of speech, religion, and association, and seeks to limit the power of government to interfere with these rights. It is often associated with capitalism and the free market, where individuals are free to pursue their self-interest through economic activity, with little government regulation or intervention.