A fine creates the problem that the taxonomy must explain
Give the reader a specific situation to interpret, then use the formal explanation to make sense of it. A label or overview may already have appeared.

Freakonomics
Steven D. Levitt & Stephen J. Dubner · 111 weeksA fine creates the problem that the taxonomy must explain
SHORT SOURCE EXCERPT“three basic flavors of incentive”
The chapter opens with a day-care fine followed by more late pickups. After introducing economic, social and moral incentives, the authors return to the fine and argue that it changed the relationship between payment and guilt.
The sequence makes the distinction do work on an already familiar problem. The return also complicates the first obvious explanation that the price was simply too low.
The source in context.
A late-pickup fine opens a discussion of economic, social and moral incentives. Teachers, wrestlers and an office bagel business then let the authors examine cheating, display traces in data and describe ways of testing suspicious patterns.
Open this chapterWhat this example supports
The sequence makes the distinction do work on an already familiar problem. The return also complicates the first obvious explanation that the price was simply too low.
Its limit
This is the source’s interpretation of the reported study. It does not show that every fee displaces a moral obligation, nor does it imply that the book withheld the word incentive until this point.
Source & edition
Steven D. Levitt & Stephen J. Dubner, Freakonomics; supplied revised and expanded edition, copyright 2005 and 2006; Adobe Digital Edition September 2009, ISBN 9780061792809.
Supplied text, lines 315–355. The short quotation is checked against the source.
The completed whole-source AI synthesis supplied candidate observations and the broad argument map. This Codex editorial pass checked original source headings, section boundaries, openings and selected argumentative contexts; inspected every retained example; checked the existing pattern dictionary and base examples; and rewrote or rejected nominations. It is a source-checked editorial pass, not a new independently adjudicated whole-book reading.
supplied revised and expanded edition, copyright 2005 and 2006; Adobe Digital Edition September 2009, ISBN 9780061792809