Figure: Increased Production 
In the accompanying graph, which of the following events could cause the upward shift of the production function?
Definitions:
Maintenance Cost
Expenses incurred to keep property, plant, and equipment in operating condition, ensuring they can perform their intended functions.
Cost Formula
A mathematical expression or equation used to calculate the total cost of producing goods or services, based on factors like raw material, labor, and overhead costs.
Planned Machine Time
The scheduled period during which machinery is expected to operate in order to meet production targets, integral to manufacturing efficiency and planning.
Prime Costs
The combined costs of direct materials and direct labor that are directly attributable to the production process.
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