What is the key factor in determining whether Radio Shack is liable under this doctrine?

Under what doctrine might Radio Shack be held liable for the tort committed by Richmond?
What is the key factor in determining whether Radio Shack is liable under this doctrine?
How is Radio Shacks potential liability affected by whether Richmonds behavior constituted an intentional tort or a tort of negligence?
How might this fact affect Radio Shacks liability for Richmonds actions?

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