Final answer:
In conspiracy liability, a minimum of two parties must agree to commit an illegal act for it to occur.
Step-by-step explanation:
In the context of conspiracy liability, the number of parties required to agree depends on the specific jurisdiction and the elements of the crime. Typically, conspiracy liability requires an agreement between two or more individuals to commit an illegal act. This means that a minimum of two parties must agree for there to be conspiracy liability. For example, in the United States, federal law defines conspiracy as an agreement between two or more persons to commit a crime.