Final answer:
Supplier fraud is not among the top three causes of shrinkage; the main causes include employee theft, shoplifting, and administrative errors.
Step-by-step explanation:
The question pertains to the retail industry and its operational concerns, particularly the causes of inventory losses, often referred to as shrinkage. Among the options provided, supplier fraud is generally not considered one of the top three causes of shrinkage. The leading causes of inventory shrinkage typically include employee theft, shoplifting, and administrative errors. These three factors can significantly impact a retailer's bottom line and are a major focus of loss prevention strategies.