FIXED FEE is a set price for the completion of a project. It is easier for the customer to budget, but provides higher risk for the contractor due to cost overruns.
DISCOUNT ALLOWED, normally, is a reduction of the invoice amount for early payment of the invoice value.
ASSURANCE has been defined by the American Institute of Certified Public Accountants (AICPA) as "Independent Professional Services that improve information quality or its context". Such services are very broad and could include assessments of various industries, e.g., Internet security or quality of health facilities.
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