Semi-variable costs or mixed costs are costs that have both fixed and variable components.
They are variable until certain production level, then increase in step and after that grow variably again. (58)
They include for example costs with a standing (fixed) fee and a variable component that is charged per unit consumed (e.g. power).
(58)
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Used literature:
58. Miroslav Keřkovský. Ekonomie pro strategické řízení. 1. vyd. Praha: C.H. Beck, 2004. Počet stran: 184. ISBN 80-7179-885-1