What is the term for the $500,000 required by Acme Insurance Group from Willis Construction?

The term for the $500,000 required by Acme Insurance Group from Willis Construction in this context is best described as collateral. Collateral is an asset or a financial guarantee that is pledged by a borrower to secure a loan or credit, helping to mitigate the risk for the lender. In this situation, Acme Insurance Group may require the $500,000 to ensure that they have a form of security in place should Willis Construction fail to meet their obligations or financial commitments.

This concept is particularly relevant in insurance and construction sectors where large sums of money are involved, as it gives the insurer a way to safeguard against potential losses. By using collateral, the insurer can manage their risk more effectively while providing coverage for the construction firm.