Final answer:
The statement is false; there is consideration in John's promise to pay Robert, as both parties are exchanging something of value, making it a valid component of contract law.
Step-by-step explanation:
The question is addressing an area of contract law, specifically the requirement of consideration. Consideration is a crucial element in forming a valid contract; it refers to something of value that is exchanged between parties. In the scenario where John promises to pay Robert $100 per week in exchange for Robert's promise not to beat him up, this constitutes consideration. John is offering money, which is a benefit to Robert, while Robert is providing forbearance (the restraint from doing something he has the legal right to do), which is a detriment to himself but a benefit to John. Therefore, the statement that there is no consideration for John's promise is false. For a contract to be enforceable, there must be a bargained-for exchange where both parties receive something of legal value, which in this case, they do.