What indicator may suggest the need for investigation regarding transactions?

An unusually high maximum ticket size can be a significant indicator that warrants further investigation regarding transactions. This is because a spike in the maximum ticket size might signal potential fraud, money laundering, or non-compliant behavior, especially if it deviates from the norm or established patterns for that particular merchant or industry. High-value transactions, especially if they are inconsistent with historical data or the nature of the business, can raise red flags and prompt a deeper review of the transaction's legitimacy and the corresponding business practices involved.

In comparison, while the average ticket size may provide some insights, it does not highlight extreme outliers that could indicate potential issues. The volume of transactions submitted could reflect normal business fluctuations, and the number of successful transactions processed typically indicates healthy operations without focusing on the individual transaction sizes that might be problematic. Therefore, it's the maximum ticket size that serves as a more immediate and concerning indicator of potential risk.