No. 101 · People · Military and War
Redline
A limit decided in advance stops you giving ground one small step at a time.
In the Almanac
“Crossing the Rubicon”, 49 BC · “Signal”, 2023
Both stories in full, three ways to use it and where it misleads.
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Questions
What is Redline?
A Redline is a predetermined limit that signals serious consequences if crossed. It turns vague preferences into firm rules, guarding you against gradual drift and pressure in the moment.
How do you use Redline?
Set redlines before negotiations, money decisions or difficult conversations, write them down, and state them clearly. Then enforce them calmly. Use them sparingly, because unenforced lines erode credibility and rigid lines can trap you when circumstances change.
When does Redline matter?
Redline is one of the 60 mental models for people, the situations where you ask: Why do people act as they do, and how do I work with them? Within that, it belongs to “Negotiating and conflict”, alongside Appeasement, Best Alternative to a Negotiated Agreement and Call Your Bluff.
What is an example of Redline?
Two stories show it at work: Crossing the Rubicon (49 BC) and Signal (2023). Both are told in full in The Mental Models Daily Almanac, which has two stories for each of its 365 models.
Which mental models are related to Redline?
Burn the Boats, Best Alternative to a Negotiated Agreement and Commitment and Consistency Bias. Redline itself comes from military and war.