The New York Times–bestselling author of Nudge examines the prevelance and burden of ‘sludge’—red tape and unnecessary paperwork—and why we must do better.

“If nudges have a mortal enemy, or perhaps the equivalent of antimatter to matter, it’s ‘sludge’.” —Forbes

We’ve all had to fight our way through administrative sludge—filling out complicated online forms, mailing in paperwork, standing in line at the motor vehicle registry. This kind of red tape is a nuisance, but, as Cass Sunstein shows in Sludge, it can also impair health, reduce growth, entrench poverty, and exacerbate inequality. Confronted by sludge, people just give up—and lose a promised outcome: a visa, a job, a permit, an educational opportunity, necessary medical help. In this lively and entertaining look at the terribleness of sludge, Sunstein explains what we can do to reduce it.

Because of sludge, Sunstein, explains, too many people don't receive benefits to which they are entitled. Sludge even prevents many people from exercising their constitutional rights—when, for example, barriers to voting in an election are too high. (A Sludge Reduction Act would be a Voting Rights Act.) Sunstein takes readers on a tour of the not-so-wonderful world of sludge, describes justifications for certain kinds of sludge, and proposes “Sludge Audits” as a way to measure the effects of sludge. On balance, Sunstein argues, sludge infringes on human dignity, making people feel that their time and even their lives don't matter. We must do better.
Cass R. Sunstein is Robert Walmsley University Professor at Harvard Law School and Chair of the Technical Advisory Group on Behavioral Insights and Sciences at the World Health Organization. He is the author of The Cost-Benefit Revolution, How Change Happens, Too Much Information, Sludge (all published by the MIT Press), Nudge (with Richard H. Thaler), and other books.
 
Preface ix
1 A Curse 1
2 Sludge Hurts 21
3 Sludge as Architecture 35
4 Sludge in Action 45
5 Reasons for Sludge 73
6 Sludge Audits 91
7 The Most Precious Commodity 109
Acknowledgments 113
Notes 115
Index 141

About

The New York Times–bestselling author of Nudge examines the prevelance and burden of ‘sludge’—red tape and unnecessary paperwork—and why we must do better.

“If nudges have a mortal enemy, or perhaps the equivalent of antimatter to matter, it’s ‘sludge’.” —Forbes

We’ve all had to fight our way through administrative sludge—filling out complicated online forms, mailing in paperwork, standing in line at the motor vehicle registry. This kind of red tape is a nuisance, but, as Cass Sunstein shows in Sludge, it can also impair health, reduce growth, entrench poverty, and exacerbate inequality. Confronted by sludge, people just give up—and lose a promised outcome: a visa, a job, a permit, an educational opportunity, necessary medical help. In this lively and entertaining look at the terribleness of sludge, Sunstein explains what we can do to reduce it.

Because of sludge, Sunstein, explains, too many people don't receive benefits to which they are entitled. Sludge even prevents many people from exercising their constitutional rights—when, for example, barriers to voting in an election are too high. (A Sludge Reduction Act would be a Voting Rights Act.) Sunstein takes readers on a tour of the not-so-wonderful world of sludge, describes justifications for certain kinds of sludge, and proposes “Sludge Audits” as a way to measure the effects of sludge. On balance, Sunstein argues, sludge infringes on human dignity, making people feel that their time and even their lives don't matter. We must do better.

Author

Cass R. Sunstein is Robert Walmsley University Professor at Harvard Law School and Chair of the Technical Advisory Group on Behavioral Insights and Sciences at the World Health Organization. He is the author of The Cost-Benefit Revolution, How Change Happens, Too Much Information, Sludge (all published by the MIT Press), Nudge (with Richard H. Thaler), and other books.
 

Table of Contents

Preface ix
1 A Curse 1
2 Sludge Hurts 21
3 Sludge as Architecture 35
4 Sludge in Action 45
5 Reasons for Sludge 73
6 Sludge Audits 91
7 The Most Precious Commodity 109
Acknowledgments 113
Notes 115
Index 141

What Students Will Be Reading: Campus Common Reading Roundup, 2025-26

With the fall semester in full swing, colleges and universities around the country have announced their Common Reading books for the upcoming 2025-26 academic year. We’ve compiled a list of over 286 programs and their title selections from publicly available sources, which you can download here: First-Year Reading 2025-26. We will continue to update this

Read more

Register for the 2026 Penguin Random House First-Year Experience® Conference Author Events!

Penguin Random House Author Events at the 45th Annual First-Year Experience® Conference February 15-18, 2026 Seattle, Washington Hyatt Regency Seattle Click Here to RSVP A complimentary meal and a limited number of books will be available to attendees. Each event will also be followed by an author signing. Interested in hosting one of these authors at

Read more

2026 Catalog for First-Year & Common Reading

We are delighted to present our new First-Year & Common Reading Catalog for 2026! From award-winning fiction, poetry, memoir, and biography to new books about the environment, current events, history, public health, science, social justice, student success, and technology, the titles presented in our common reading catalog will have students not only eagerly flipping through

Read more