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 Shack’s potential liability affected by whether Richmond’s behavior constituted an intentional tort or a tort of negligence?
Suppose that when Richmond applied for the job at Radio Shack, she disclosed in her application that she had previously been convicted of felony assault and battery. Nevertheless, Radio Shack hired Richmond as a cashier. How might this fact affect Radio Shack’s liability for Richmond’s actions?

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