When two parties enter into a contract or agreement, they typically outline their obligations and responsibilities within the document. However, there are times when an agreement may not exist, or the terms of the agreement are unclear. In these cases, the law steps in to create obligations and responsibilities for both parties. Here are some examples of obligations created by the law in the absence of an agreement:

1. Good faith and fair dealing: Every contract contains an implicit requirement that both parties act in good faith and deal fairly with one another. This means that if a party fails to act in good faith or violates the principle of fair dealing, they may be in breach of the contract.

2. Implied promises: The law may create implied promises when a contract is silent on a particular issue. For example, if you hire a contractor to build a deck and do not specify a completion date, the law may imply that the contractor must complete the project within a reasonable time frame.

3. Payment: In the absence of an agreement, the law may require parties to pay for goods or services received. For example, if you visit a doctor and do not sign an agreement for their services, you are still obligated to pay for their services.

4. Reasonable care: The law may create an obligation for parties to exercise reasonable care in their actions. For example, if you rent a car and do not sign a contract, you are still obligated to operate the vehicle with reasonable care to avoid accidents and damages.

5. Non-disclosure: In some cases, the law may create an obligation for parties to maintain confidentiality or not to disclose certain information. For example, if you have a confidential relationship with someone, the law may imply that you cannot disclose that information to others.

In conclusion, while it is always best to have an agreement in place to clearly outline the obligations and responsibilities of both parties, the law does step in to create obligations in the absence of an agreement. These obligations may include acting in good faith and fairly dealing with one another, making payments for goods or services received, exercising reasonable care, and maintaining confidentiality. As always, it is important to consult with a legal professional to ensure that your obligations and responsibilities are properly defined and understood.