A friend, Elwyn, comes to you with a question. He has applied for employment with a temporary help agency. On the reverse side of the application there is a policy statement that states the applicant understands that he or she is not required to work on any day and retains the choice of whether to report to the agency's office to indicate availability for an assignment. He wants to know whether, and, if so, how, this statement could affect his rights under employment legislation. Describe to Elwyn the legal effect of this policy statement.