Which of the following is NOT a valid source of insurable interest?

Insurable interest is a fundamental principle in insurance that requires the policyholder to have a legitimate interest in the insured's life. This is typically because the loss of the insured would result in some form of financial loss or hardship for the policyholder.

When considering the sources of insurable interest, the life of a family member is a valid source, as family members typically share financial responsibilities and emotional ties. Similarly, having insurable interest in the life of a business partner is valid, as the death of a partner could significantly impact the business's operations and profitability.

The life of a key employee also represents a valid source of insurable interest because such individuals contribute significantly to the success or continuation of a business. The loss of a key employee can lead to financial loss, making it justifiable for the employer to procure life insurance on that employee.

In contrast, the life of a stranger does not represent a valid source of insurable interest. Insuring a stranger does not establish a financial relationship or potential loss that the policyholder would face in the event of the stranger's death. Thus, the lack of a legitimate financial interest in the life of a stranger makes it impossible to justify purchasing life insurance on their behalf, which is why this option is not