Consider the following organizational scheme.The species are not equally abstract at some levels of organization.But the problem could be fixed by inserting which of the following concepts? 
Definitions:
Economies of Scale
Cost benefits that companies achieve because of their large scale of operations, generally resulting in a lower cost per output unit as the scale increases.
Per-Unit Costs
The average cost for each individual unit of product produced, taking into account all fixed and variable expenses.
Marginal Costs
The incremental cost involved in producing one more unit of a product or service.
Learning Curve
The concept that people improve efficiency and decrease cost over time as they gain experience in a particular task or operation.
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