Cass R. Sunstein

Cass R. Sunstein

"Never underestimate the power of inertia — and that power can be harnessed."

Cass R. Sunstein is a Harvard Law professor and one of the most cited legal scholars in the world. He co-authored Nudge with economist Richard Thaler, introducing 'choice architecture' — the idea that how options are presented predictably shapes decisions — into mainstream policy and business thinking, and later served in the Obama administration applying these ideas to federal regulation.

Co-author of Nudge·Professor, Harvard Law School·Key themes: choice architecture, behavioral economics, decision-making
Cass R. Sunstein

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Key Ideas & Recurring Themes

Choice Architecture

Every decision is presented within some structure — a menu, a form, a default setting — and whoever designs that structure, the 'choice architect,' inevitably shapes the outcome, whether they intend to or not.

Defaults Are Powerful Nudges

Because of loss aversion and inertia, whatever option is set as the default tends to attract the largest share of choices — a finding with major implications for retirement savings, organ donation, and beyond.

Libertarian Paternalism

Nudge argues it's possible to steer people toward better decisions without restricting their freedom to choose otherwise — preserving options while designing the default path toward what people would choose for themselves with full information.

Notable Quotes

"A choice architect has the responsibility for organizing the context in which people make decisions."
— Nudge
"The combination of loss aversion with mindless choosing implies that if an option is designated as the 'default,' it will attract a large market share. Default options thus act as powerful nudges."
— Nudge
"First, never underestimate the power of inertia. Second, that power can be harnessed."
— Nudge
"A nudge, as we will use the term, is any aspect of the choice architecture that alters people's behavior in a predictable way without forbidding any options or significantly changing their economic incentives."
— Nudge

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Book Author Cass R. Sunstein