---
name: maa-21-congestion-incentives
description: "Compare Braess equilibrium, social optimum, tolls, and overhead. Use for Braess workflow congestion, private equilibrium social routing cost, toll institution incentive design."
---

# Markets, Teams, and Institutions

Can a faster-looking route make the whole workflow slower?

Use this skill to produce the chapter's supported calculation or trace report from declared inputs. Read [method and assumptions](references/method.md), then [input contract](references/input-contract.md) when preparing user data. The canonical chapter source and its equation locators are recorded in [chapter reference](references/chapter.json).

For teaching, start from `--case example`; for a changed assumption use `--case changed`. For supplied inputs, validate their shape against the contract and pass `--input`. Do not silently replace missing user data with fictitious values.

Run the bundled helper with the available Python interpreter:

```bash
python3 scripts/run.py --case example --text
python3 scripts/run.py --input /path/to/inputs.json --output /path/to/report.json
```

Paths to the helper are relative to this skill directory. In a shell, resolve them from the actual installed skill path rather than assuming the current directory. The helper locates the matching bundle automatically. Figure export is optional and requires its notebook dependencies; use `--figure /path/to/chart.svg` with the bundle's notebook interpreter.

Inspect the calculated quantities, assumptions and limitations before writing the answer. Deliver the requested decision, calculation, trace or procedure, not a chapter summary. State which input contract and method ran. Input values may be observations or judgments; their presence in JSON does not verify their provenance, representativeness or causal meaning.

For transfer examples and failures, read [worked use cases](references/use-cases.md). These support diagnosis rather than replacing the user's question.

If Python execution is unavailable, give a tractable hand calculation or the precise method, and label it as not executed. If the runtime is missing, identify that installation problem rather than inventing output. A capability or utility calculation never supplies permission for an external action.