What is a Contract of Adhesion?

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Ambiguities in contracts of adhesion typically arise because the agreement is drafted entirely by one party—usually the one with greater bargaining power—while the other party has little to no opportunity to negotiate or clarify terms. This one-sided drafting can lead to vague, overly broad, or complex language that favors the drafter.

Courts often interpret such ambiguities against the drafter under the doctrine of contra proferentem. For example, if a clause in a standard-form insurance policy could be read two ways, the interpretation favoring the insured party usually prevails. These ambiguities highlight the importance of transparent language, clear definitions, and review before acceptance—especially in mass-market agreements like software licenses, rental contracts, or insurance policies.

While both terms describe specialized types of agreements, they differ fundamentally in purpose and structure:

Aspect

Aleatory Contract

Contract of Adhesion

Definition

A contract where performance depends on a future uncertain event.

A standardized “take-it-or-leave-it” contract drafted by one party.

Key Feature

Mutual risk—each party’s obligation is triggered by chance or contingency.

Unequal bargaining power—one party dictates the terms.

Common Examples

Insurance policies, derivatives, or gambling contracts.

Consumer service agreements, software licenses, rental or loan agreements.

Legal Focus

Enforceability depends on occurrence of a specific event.

Enforceability often examined for fairness and lack of negotiation.

Risk Type

Based on uncertainty or probability.

Based on imbalance in negotiating power.

In short, aleatory contracts revolve around uncertainty of outcome, while contracts of adhesion revolve around inequality of negotiation.

No. While they are common in consumer-facing industries, contracts of adhesion are also used in B2B contexts—especially in SaaS, logistics, and commercial services where businesses offer standardized terms to smaller partners or users with less negotiating power.

 In some cases, yes—particularly in high-value transactions or where a party has significant leverage (e.g., enterprise customers). While the base contract may be standardized, businesses sometimes allow limited redlining or addendums for select clients.

Absolutely. Fairness and transparency are key. Clear language, easily accessible terms, and customer support for clarification can make even non-negotiable contracts feel trustworthy. Overreaching or hiding critical clauses, on the other hand, can damage brand perception.

 Yes. Industries like insurance, telecom, financial services, and online platforms are more frequently scrutinized, especially when contracts include arbitration clauses, limitations of liability, or waiver of legal rights. Courts tend to examine these industries closely for procedural and substantive fairness.

Yes. While the general principles (like unconscionability and reasonable expectations) are common in many legal systems, the threshold for enforceability, consumer protection standards, and treatment of digital consent can vary widely by country or even by state.