The shift in the PAE line shown in the Keynesian cross diagram may be caused by which of the following? 
Definitions:
Specified Threshold
A predetermined level or point at which an action is triggered or a condition changes, often used in decision-making processes.
Supply Chain Manager
A professional responsible for overseeing and managing a company's supply chain and logistics strategy and operations.
Safety Inventory
Extra inventory held by a company to prevent stockouts caused by uncertainties in demand or supply, ensuring product availability.
Product Availability
The extent to which a product can be purchased or obtained when desired by a customer.
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