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In a service-oriented, utility-computing, Grid-like world, service providers will execute jobs on behalf of their clients on systems rented from resource providers. This poses many challenges to the service provider, such as choosing which jobs to admit, when to run them, whether to execute them on one system or many, and how many resources to rent. To complicate matters, the service provider may experience resource uncertainty an inability to get the resources it needs or expects. The result will be sub-optimal choices of which jobs to accept and when to run them, and the service provider may have to pay penalties to its clients. Using an economics-based approach, we have developed scheduling policies that systematically address these problems. We show that the new policies deliver significantly more profit (or added value) than ones oblivious to such concerns.