When economic times are tough, everyone is affected. Many of the television networks are cutting costs. One cost-cutting measure was communicated to the star of one of the top shows in a letter asking the star to agree to a salary freeze and forego his contractual raise for next year to assist in the cost-cutting measures. The star refuses. The network does not provide the raise, stating that the letter he received was a contract modification. The star sues the network. What are the issues between the parties?