How do I handle clients who want ongoing work but low rates?

[Btaliat]

More often than not, freelancers would have come across clients that want to pay low rates for their ongoing work. Despite the fact that they have finalized the price before starting, they will still renegotiate and offer low rate. In this situation, what do you think a freelancer has to do? Nothing than to stand on the initial price negotiated or he also changes his deliverable. What will you suggest for the freelancer in such a situation?