Nudge: Improving Decisions About Health, Wealth, and Happiness is a book by Richard H. Thaler and Cass R. Sunstein that explores the concept of "nudging" as a means of influencing people's behavior in a particular direction. The authors argue that people often make decisions that are not in their best interest, due to a variety of factors such as lack of time, lack of attention, or simple forgetfulness. Nudging can be used to help people make better choices by presenting them with options that are more easily accessible or more salient, or by providing them with more information about the consequences of their actions.

The book discusses various examples of nudging in different contexts, such as health, finance, and the environment. For instance, in the realm of public health, nudging can be used to encourage people to eat healthier foods or to get vaccinated. In the realm of finance, nudging can be used to encourage people to save more money or to make more informed investment decisions. And in the realm of the environment, nudging can be used to encourage people to conserve energy or to reduce their carbon footprint.

The authors also discuss the potential for governments and policymakers to use nudges to promote the public good. They argue that nudging can be an effective way to influence behavior in a positive direction without resorting to more heavy-handed measures such as taxes or regulations. However, they also caution that nudges should be used with care to ensure that they respect people's autonomy and do not unduly manipulate their choices.

In addition to discussing the practical applications and ethical considerations of nudging, the book also explores the psychological and behavioral factors that underlie people's decision-making processes. It offers insights into why people often make choices that are not in their best interest, and it provides strategies for how to nudge them towards more desirable outcomes.