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Wind travels at a _____ speed than water but has a _____ density which allows it to carry mainly clay- and silt-size particles.
Sunk Cost
Expenses that are already spent and cannot be retrieved or changed by any future activities.
Opportunity Cost
The foregone benefit that would have been derived by choosing an alternative option.
Differential Cost
A future cost that differs between any two alternatives.
Variable Cost Per Unit
The cost that varies with each unit produced, not including fixed costs.
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