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How AI can optimize your existing borrower pools

Feb 6, 2020 / Consumer Banking / Technology

Consumer borrowing is at a record $14 trillion in the U.S. While lenders may see pockets of additional growth here and there, the credit economy is long overdue for some cooling, or even a reversal. If (or should we say when) the economy turns, the banks and lenders who most efficiently tighten up their credit portfolios will be best prepared to deal with a financial decline.

That doesn’t have to mean abandoning higher-risk borrowers and rushing to an all-prime portfolio. Lenders can now use complex machine-learning models that rely on hundreds or even thousands of times more variables to assess risk. These new and better technology tools can analyze overall portfolio risk with a finer lens and use those insights to, for example, adjust price on incoming borrowers to optimize yield heading into a downturn.

A January 2020 working paper from the International Monetary Fund found that the adoption of information technology in banking can enhance financial stability through better monitoring and screening of risk. The study found that tech-enabled banks made loans that performed the same as peers during a period of economic growth but performed better in a downturn, thus leading to greater financial resilience.

Lenders can price more accurately for risk when they’re armed with more data to understand new and current customers.

Standard logistic-regression models typically rely on a couple of dozen uncorrelated variables, such as credit score and loan-to-value. Machine learning (ML) greatly expands the lender’s potential data set to include many more variables that extend well beyond what’s on a conventional credit reporter. This can include a consumer’s cash flow, installment loan history, call-center activity, length at current employer, length at residence and monthly rent payments. The additional data can create a much broader picture of a consumer’s real credit health and risk of default beyond a single three-digit credit score.

Lenders that tap into the correlations from all this new data can use those insights to score borrower pools with more fidelity. They can move less risky customers into lower-price tiers, giving the best customers a price cut to retain their business. The lender can more than make up for the foregone revenue by moving a greater number of higher-risk applicants into costlier tiers.

Contrary to popular belief, increasing prices on borrowers does not result in a drop in demand. Research has shown that borrowers are not price-sensitive when it comes to credit. As a result, by improving their risk assessment of existing customers, lenders can see real boosts in revenue. Our analysis has shown that lenders who more accurately assess borrower risk and segment customers accordingly can see their overall portfolio yields increase by $500,000 to $4 million per $100 million of originations.

During a downswing, lenders should want as much granularity as they can get to reduce defaults and build more resilience into their portfolios. Standard logistic regression models have been around for a long time – and the best ones produced the most resilient loans before 2008 – but machine-learning models are promising a better path for optimizing portfolios for good times and bad.

A properly monitored machine-learning model, trained on a broader data set with infinitely more correlation analyses, has a better ability to detect shifts in consumer credit quality before actual losses take place. By spotting outlier applicants that a traditional monitoring approach missed, an ML-monitoring tool that we built for a consumer lender in Turkey caught the effects of economic disruption from its currency devaluation early enough for the lender to refit its model to a new default target and avoid bigger losses.

The adoption of machine learning in credit will change how lenders operate. The most resilient portfolios will incorporate dynamic risk modeling that considers thousands of variables – not just a handful.

Seth Silverstein is executive vice president, credit analytics, at Zest AI.

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