
In the world of contracts, there are two main types: unilateral and bilateral. A unilateral contract is one where one party makes an offer and the other party accepts by performing a specific action, as seen in the example of a reward offer where someone promises a reward for bringing in a lost cat.
This type of contract is often seen in advertisements, where a company offers a reward for information leading to the return of a lost item.
A bilateral contract, on the other hand, is where both parties make an offer and acceptance simultaneously, as in the case of a job offer where an employer offers a salary and the employee accepts by signing a contract.
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What Is a Contract?
A contract is a promise in exchange for a promise, where both parties are obligated to perform their promised actions. This is the essence of a bilateral contract.
A bilateral contract involves promises from both parties, making it a two-way street. For instance, a contract to procure goods from a supplier requires both the supplier and the buyer to fulfill their obligations.

The buyer must pay the specified price in exchange for the goods, while the supplier must deliver the goods as described. This mutual obligation is what makes a bilateral contract binding.
If either party fails to meet their obligations, the other can sue for breach of contract. This is why it's essential to understand the terms and conditions of a bilateral contract before signing.
Types of Contracts
Contracts can be categorized into two main types: unilateral and bilateral. A unilateral contract is a one-way promise, where one party makes a promise and the other party has the option to accept it.
A classic example of a unilateral contract is a reward offer, like offering a reward for finding a lost puppy. This type of contract is not binding on the other party, who is free to choose whether to accept the offer.
A bilateral contract, on the other hand, is a two-way promise, where both parties have obligations they must fulfill. An employment agreement is a common example of a bilateral contract, where you agree to work for an employer and the employer agrees to pay you.
Enforcing

Enforcing unilateral and bilateral contracts requires different approaches due to their distinct nature.
Unilateral contracts are particularly challenging to enforce because they're one-sided, meaning one party's promise is made without any reciprocal obligations.
Verifying completion of specific actions, which unilateral contracts are contingent on, can be complex and lead to disputes over fulfillment.
Careful navigation is needed to address disputes arising from bilateral contracts, where parties should first try to resolve issues amicably through mediation or negotiation.
Formal dispute resolution methods like arbitration or litigation may be necessary if negotiation fails, ensuring legal compliance and fair outcomes.
Revocability
Revocability is a key aspect of contracts, and it's essential to understand the difference between unilateral and bilateral contracts in this regard.
A bilateral contract can be revoked by the offeror before it's signed or otherwise accepted by the offeree. Contracts don't need to be in writing to be valid, so acceptance communicated over the phone, email, or in person can preclude the revocation of an offer.

If a business submits a proposal in response to an RFP, acceptance of the proposal by the business can convert the proposal into a legally binding contract. This requires the proposal to contain all the elements of a contract: an offer, consideration, and acceptance.
A unilateral contract, on the other hand, can be revoked by the offeror at any time before an offeree accepts by performing or beginning to perform the action requested. The type of offer will determine how much action on the part of the offeree constitutes acceptance, precluding revocation by the offeror.
A reward-type unilateral contract, like the one a neighbor might offer for the return of their lost dog, can be revoked even if the offeree has already spent time searching for the dog. However, a performance-type unilateral contract, like a freelancer's offer to complete a project, may be considered irrevocable once the offeree begins work on the project.
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When to Seek Legal Advice
Knowing when to seek legal guidance can prevent and mitigate contractual disputes. You'll want to consult legal experts when faced with intricate bilateral contract disputes involving multiple obligations or significant financial stakes.
Consulting legal experts during contract drafting is smart, as it ensures your contracts are clear, enforceable, and in alignment with legal standards.
Bilateral contracts can be complex, making it essential to seek legal advice to avoid disputes.
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Effective Management
Effective management is crucial when dealing with contracts. Companies must ensure they abide by the terms of all their contracts, unilateral and bilateral alike.
Keeping track of contractual obligations can be a challenge, especially when dealing with multiple suppliers. A robust contract management software can simplify and improve all aspects of the contract management process.
Automated workflows for review and approvals can speed up the contract cycle time. This allows companies to stay on top of their contractual obligations and maintain a positive brand image.
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Collaboration is key in contract management. Line of business integrations can enhance collaboration, ensuring that everyone is on the same page.
Pre-approved templates can reduce the risk of unapproved or inconsistent contract language and other errors in the contracting process. This helps prevent costly mistakes and maintains a professional image.
Contract version control is essential to ensure everyone has access to the most up-to-date information available. This can be achieved through a robust contract management software.
Here are some key features of effective contract management:
Regularly reviewing and updating contracts can also improve compliance with company policies, industry standards, and regulatory requirements. This helps maintain a positive brand image and avoids unnecessary legal expenses.
Additional Considerations
In a unilateral contract, the offeree's obligation is not reciprocal, meaning they don't have to perform the same action in return.
The key difference between unilateral and bilateral contracts is the level of commitment from each party.

A unilateral contract is typically used for situations where one party is making a promise to the other, but the other party's obligation is not yet certain.
In a bilateral contract, both parties are making reciprocal promises to each other.
Unilateral contracts are often used for contests or competitions, where the winner receives a prize.
Bilateral contracts, on the other hand, are used for everyday business transactions, such as buying and selling goods.
Sources
- https://www.concord.app/blog/unilateral-vs-bilateral-contract/
- https://law.jrank.org/pages/5587/Consideration.html
- https://www.contracts365.com/blog/understanding-unilateral-and-bilateral-contracts-for-effective-contract-management
- https://corporatefinanceinstitute.com/resources/valuation/unilateral-contract/
- https://www.rocketlawyer.com/business-and-contracts/business-operations/legal-guide/whats-the-difference-between-bilateral-and-unilateral-contracts
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