Final answer:
The dishonest act of stacking empty boxes to inflate inventory is known as physical padding, which is an unethical accounting practice.
Step-by-step explanation:
The scheme adopted by Ace Electronics' managers in which empty boxes are stacked in the warehouse to create the illusion of extra inventory is known as physical padding. This unethical practice is designed to deceive auditors by artificially inflating the company's inventory figures, suggesting a healthier financial status than what truly exists. It is important for businesses to follow ethical accounting practices, and physical padding is a clear violation of such standards.