Brian Diepold, Pitney Bowes Business Insight
It’s pretty well recognized that the deeper the relationship with the customer, the more valuable it is for the bank and the customer. For years we have been preaching cross-sell as the way to build relationships, gain lasting customers, and run a profitable bank. It’s also generally regarded that cross-sell leads to customer retention. There may have been a bit of chicken and the egg with this part, but I think that has been resolved by looking at the timing of most cross-selling. As we all know very well by now, the great majority of cross-sell takes place within the first 90 days.
I’m willing to take that as evidence of causality – cross-sell does in fact lead to customer retention, not the other way around. The luxury of having millions of customer data records is that one cannot find themselves bored. It seemed like a worthy endeavor to quantify the actual impact of cross-sell on customer retention. And with that, enter 80MM customer account records. By quantifying this relationship, we can see the direct impact of a firm’s strategic initiative and diagnose the types of households where cross-sell is more important to strengthening the relationship and increasing the probability of retaining the household. The analysis uses a logistic model to determine the impact of cross-sell on the probability of retaining a household.
The bottom line is that regardless of how you measure cross-sell ratios, you can find the intuitive relationship that more products per household lead to a higher probability of retaining that household. We also find a diminishing marginal return – i.e., the first cross-sell is the most important to establishing the relationship. While each additional product does increase the likelihood of retention, the biggest jump is with the first cross-sell. Rather than rewrite the research paper, I’ll just highlight some of the key findings:
- Moving from one product to two for the household yields the greatest increase in the probability of retention.
- Households with low deposit dollars yield an 8 – 10% increase in the likelihood of retention through cross-sell.
- Households with mortgages or interest-bearing deposits as the lead product also yield an 8 – 10% increase in the likelihood of retention through cross-sell.
If you have the luxury of focusing your resources on certain types of households, these are the ones where you can make the biggest impact.



