Screening

Prime #

506

Origin domain

Economics & Finance

Also from

Operations Research, Psychology

Aliases

Self Selection Mechanism, Menu Design, Sorting Mechanism

Related primes

Signaling, Information Asymmetry, Adverse Selection, Moral Hazard, Mechanism Design, Incentive Compatibility, Price Discrimination, Agency Problem

Core Idea

Screening is the flip side of signaling, where an uninformed party (like an employer or insurer) designs tests, deductibles, or selection processes that induce the informed side to self-reveal hidden attributes, mitigating adverse selection.

How would you explain it like I'm…

Pick to tell

Imagine a lemonade stand selling two sizes: a small cup for a little money and a giant cup for a lot. Big-thirsty kids pick the giant cup; small-thirsty kids pick the small one. You didn't have to ask how thirsty they were — they told you by which one they bought. Screening means setting up choices so people show you who they are by what they pick.

Sort By Choice

Sometimes you need to know something about a person but you can't just ask and trust the answer — like how risky a driver someone is, or how much they really want a job. Screening is a clever trick: you offer a menu of different deals, each one designed so that different kinds of people will naturally pick different options. A safe driver picks a low-deductible insurance plan; a risky driver picks the high-deductible one. By their choice, they tell you which type they are, even though you couldn't see it directly.

Self-selecting menus

Screening is a strategy used by an uninformed party who must deal with people whose hidden type matters. Instead of trying to verify the type directly, which is often impossible, the uninformed party designs a menu of options so that different types naturally find different options most appealing. When agents choose, their choice reveals their type. An insurance company offers a low-deductible expensive policy and a high-deductible cheap policy; high-risk customers prefer the first, low-risk customers prefer the second, and the company can charge accordingly. Screening is the response to adverse selection: rather than offering one product to a mixed pool and getting stuck with the worst customers, the menu sorts them.

 

Screening is a mechanism-design response to information asymmetry, specifically adverse selection. When an uninformed party (the principal) must transact with agents whose private types they cannot observe (insurance risk, productivity, willingness to pay), the principal designs a menu of contracts, combinations of price, quantity, quality, deductible, coverage, or duration, structured so that each type finds it in its own interest to choose a different option. This self-selection (formally, incentive compatibility) makes the chosen contract reveal the agent's type, enabling differential treatment without direct verification. Screening contrasts with signaling, where the informed party moves first to reveal its type (e.g., costly education in Spence's model); in screening, the uninformed party moves first by offering the menu. The term was introduced by Stiglitz (1975) in the context of labor-market sorting. The benchmark against which a screening menu is evaluated is the uniform-product market that collapses under adverse selection.

Broad Use

• Insurance: Companies set deductibles or require medical exams, prompting healthier clients to accept certain terms while riskier individuals reveal themselves.

• Hiring: Employers pose skill-based challenges or multi-stage interviews, gleaning real capabilities beyond candidate claims.

• University Admissions: Entrance exams or essays screen for academic fit or motivations, letting admissions identify stronger applicants.

Clarity

Underscores how the uninformed party can proactively gather data or structure conditions to differentiate types—pulling hidden info out, rather than waiting for hopeful signals.

Manages Complexity

By designing screening mechanisms, the buyer/insurer/employer obtains clarity on participants' qualities, preventing moral hazard or mismatch that arises if the other side withholds truth.

Abstract Reasoning

Again, a multi-agent, info-asymmetry scenario: screening is a universal approach to overcoming hidden trait or hidden info problems—Clever system design compels honest revelation.

Knowledge Transfer

• Online Lending: Platforms might request credit scores, financial docs, or small "collateral" steps so that riskier borrowers are less likely to apply or get approved.

• Retail: Stores offering loyalty membership with usage patterns glean which customers buy premium lines vs. discount lines, shaping marketing approaches.

Example

A health insurer offering multiple plans—low premium but high deductible vs. higher premium but low deductible—screens policyholders: healthier people choose one plan, sicker individuals pick another, revealing their risk profile in the process.

Relationships to Other Primes

Parents (2) — more general patterns this builds on

• Screening is a kind of Mechanism Design — Screening is a specialization of mechanism design in which the designer is the uninformed party building a menu to elicit hidden types through self-selection.
• Screening presupposes Information Asymmetry — Screening presupposes information asymmetry because the menu-design strategy it names is a response to unequal private knowledge held by the other side.

Path to root: Screening → Mechanism Design

Not to Be Confused With

• Screening is not Signaling because screening is receiver-initiated menu design by the uninformed party to induce the informed party to self-reveal their type through choice, while signaling is sender-initiated costly communication by the informed party. Screening responds to adverse selection by creating incentive-compatible options; signaling responds by making type-revealing investments. The two address the same problem from opposite sides.
• Screening is not Price Discrimination because screening uses contract/menu design to induce self-selection and type-revelation, while price discrimination uses price differences to capture consumer surplus once types are known or inferred. Screening solves the information problem; price discrimination exploits it. A screening equilibrium may or may not involve price differences.
• Screening is not Herding Behavior because screening is a deliberate mechanism design that exploits differences in agent preferences and willingness to pay for different contract terms, while herding is the tendency of agents to imitate observed behavior of others even when it contradicts private information. Screening is intentional institutional design; herding emerges from uncertainty and limited information.
• Screening is not Price Mechanism because screening is the structural technique of menu design to overcome information asymmetry through self-selection, while the price mechanism is the coordination function that aggregates decentralized information into a scalar signal that self-coordinates independent decisions. Screening operates when information is asymmetric; the price mechanism presumes prices reflect and aggregate available information.