Not necessarily, this is the heart of the supply-vs-demand concept. If there are a hundred other people that can do what you do for cheaper? Of course you wont

Not necessarily, this is the heart of the supply-vs-demand concept. If there are a hundred other people that can do what you do for cheaper? Of course you wont find a job. But if you're the only one? Well after all the companies tell you take a hike, and then find they can't hire anyone else - they'll come back. If the cost of paying you is less than the value you add, and they can't find any cheaper alternatives, it's in their interest to hire you. As usual, Patio11 is the best voice on this subject - read some of his posts about salary negotiation.