Investigate a Quarterly Increase in Loan Delinquency

# Investigate a Quarterly Increase in Loan Delinquency A lending business sees its delinquency rate rise in the past quarter. Explain how you would investigate the increase and distinguish measurement changes, portfolio-mix changes, loan seasoning, and deterioration within comparable borrowers or loans. Do not assume a particular delinquency threshold or portfolio dataset; state what you would request and clarify. ### What a Strong Answer Covers - A precise delinquency event, denominator, observation date, and reporting convention. - Data and servicing checks before interpreting the change as worsening credit performance. - Vintage, loan-age, risk, and product comparisons that separate mix from within-group changes. - Evidence-based hypotheses and a response that acknowledges causal and data limitations. ```hint Compare loans at similar ages A growing young portfolio and a maturing older portfolio can have different aggregate delinquency even under unchanged credit quality. ``` ### Follow-up Questions - Why can a loan-count delinquency rate and a balance-weighted rate move differently? - What would you examine if the rise is concentrated in one origination vintage?