Use this graph to answer the question that follow: 
In order to explain the interaction effect present in these data,describe two simple main effects.
Definitions:
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.
Marginal Productivity
The additional output that is produced by using one more unit of a particular input while keeping other inputs constant.
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