Key Takeaways

  • First Republic Bank regularly issued unsecured personal loans below 10% (and occasionally below 3%) to acquire early-career professionals.
  • The bank's model relied on cohort economics: the large checking deposits from these newly acquired high earners funded the low-interest loans.
  • Cash App mirrored this playbook at the consumer level by offering tiny $20 loans at near-zero cost to win top-of-wallet spending status.
  • The profit engine in consumer finance is the spread: paying users 1 basis point on deposits while collecting 275 basis points in interchange fees or earning 5% on Treasury bills.

The Cohort Deposit Trade

Most lenders treat consumer loans as profit centers. First Republic Bank treated them as a customer acquisition cost.

Before its collapse and sale to JPMorgan Chase in 2023, First Republic targeted young professionals entering high-earning careers in tech, law, and finance. These borrowers had strong future earnings and high equity value, but they often faced a short-term cash crunch from student debt or home purchases.

First Republic gave them cheap capital to solve that immediate problem. As Patrick McKenzie explained: “First Republic, pour one out for them, they're no longer with us, now absorbed into Chase as a result of the 2023 miniature banking crisis, routinely did offer unsecured consumer debt for loan consolidation and other purposes at rates rather below 10%.”

At first glance, lending unsecured money at sub-market rates looks suicidal. But the bank was playing a cohort game. McKenzie noted that “an interesting argument that First Republic made is that not on an individual basis, but on a cohort basis, the new deposit accounts that they were attracting through this very frankly, almost absurdly attractive offer on the debt side, was funding all of the debts that they were issuing to get these new accounts.”

Once customers parked their paychecks at First Republic, the bank paid almost nothing on those checking balances. The cheap deposits from the entire group funded the cheap loans issued to bring them in.

The Cash App Micro-Lending Model

Fintech platforms use the exact same logic at the opposite end of the income spectrum. Instead of issuing a $50,000 refinancing loan to a junior partner at a law firm, Cash App experimented with micro-lending to everyday spenders.

McKenzie pointed out how Cash App approached the problem: “In a very different fashion, another thing that has been tried at least, and I don't know the current status of it, was Cash App attempting to do very, very low cost loans, low balance loans rather, on the order of $20 at very, very low costs relative to like traditional costs for payday loans.”

A $20 loan makes almost zero direct interest revenue. But if that $20 keeps a user active inside Cash App rather than switching to a competitor, the platform wins the downstream transactions.

McKenzie laid out the basic math behind account monetization: “You are paying people one basis point and taking in 275 basis points of revenue, so, okay, that's a pretty good business already. And if you're doing that for $100, but or have $400 behind it where you are paying one basis point and then putting it in T-bills for, you know, 5% or whatever T-bills earn these days, it is just a wonderful, wonderful business to be in.”

Where Loss-Leader Acquisition Breaks

Subsidizing an expensive product to capture cheap float is a great trade until macroeconomic conditions shift. First Republic's strategy worked during a decade of zero interest rates. When rates rose rapidly in 2022 and 2023, high-net-worth depositors moved their money out of near-zero checking accounts into high-yield instruments. The cheap deposits disappeared, but the long-term, low-rate loans remained on the books.

If you subsidize an initial transaction to win customer loyalty, your secondary monetization must be sticky enough to survive market cycles.

What to Do With This

Audit your product suite for cross-subsidization opportunities. Identify your highest-friction acquisition channel and calculate whether you can price it at zero (or at a loss) if doing so guarantees top-of-wallet usage for your primary monetization engine. Calculate your cohort payback period to verify that secondary revenue covers the upfront subsidy within 90 days.