Strip away the complexity and ICICI Bank runs on a simple economic engine: borrow cheap, lend dear, and collect fees on everything that moves through the pipes. But the execution of that engine at $35.4 billion in annual income involves layers that reward closer examination. The deposit franchise is the foundation. At roughly $193 billion (₹16,103 billion) in total deposits as of March 2025, ICICI funds its lending business primarily through current and savings accounts — the cheapest money in banking because customers accept near-zero interest on current accounts and modest rates on savings. The bank's CASA ratio determines how cheaply it can fund loans. Every salary account relationship, every merchant settlement account, every digital savings product that keeps money parked inside ICICI's system directly improves the cost of funds. This is why the bank obsesses over salary account wins from corporate relationships and why iMobile Pay exists as a non-customer acquisition tool — get people transacting through your platform, and deposits follow. On the lending side, the loan book stood at approximately $161 billion (₹13,418 billion) with a net interest margin of 4.32% in FY2025. That margin is the spread between what ICICI earns on its assets and what it pays for funding. A 4.32% NIM on a $161 billion book generates enormous net interest income, but the quality of that income depends entirely on who you're lending to. This is where Bakhshi's strategic shift matters most. The bank deliberately moved away from concentrated corporate exposures — the kind that blew up between 2012 and 2017 — toward millions of granular retail loans: home mortgages, auto financing, personal credit, education loans, credit card receivables. Each individual loan is small. The portfolio effect is diversification. No single borrower default can meaningfully hurt the bank. Fee income is the second engine. Approximately 18 million active credit cards generate interchange revenue every time someone taps to pay, interest income on revolving balances, annual fees, and co-brand partnership revenue (the Amazon India card alone drives significant transaction volume). Beyond cards: insurance distribution commissions from ICICI Prudential Life and ICICI Lombard, mutual fund distribution through ICICI Prudential AMC, wealth management advisory fees for affluent clients, trade finance fees from corporate banking, foreign exchange margins, and payment processing revenue from merchant acquiring. The digital infrastructure — iMobile Pay processing 558 million transactions worth $135 billion (₹11,238 billion) in FY2025, InstaBIZ growing 37% in business banking transaction value — isn't a revenue line by itself. It's a cost reducer and a cross-sell accelerator. Every customer interaction that happens digitally instead of in a branch saves the bank money. Every behavioral data point from digital transactions improves credit underwriting and product targeting. The 129,177 employees still matter for relationship management, compliance, and complex advisory, but the marginal customer is increasingly acquired and served through code rather than counters. International operations in the US, UK, Canada, Singapore, and UAE contribute a small minority of revenue, focused on non-resident Indian remittances, trade finance corridors, and corporate banking for Indian companies operating abroad. This is deliberately modest after the pre-2008 overexpansion lesson. The subsidiary ecosystem deserves separate attention. ICICI Prudential Life Insurance, ICICI Lombard General Insurance, ICICI Securities, and ICICI Prudential AMC are not just brand extensions — they're profit centers that generate fee income without consuming the bank's capital. When a savings account customer buys a life insurance policy through the bank's platform, ICICI earns a distribution commission at essentially zero marginal cost. Multiply that across 60 million iMobile users and the economics become compelling. At $103 billion market capitalization — roughly 3x book value — investors are pricing in the belief that this machine can compound at 15-20% annually for years. Whether that's justified depends on one variable: can ICICI keep growing retail assets without repeating the credit mistakes of 2012-2017? So far under Bakhshi, the answer has been yes. But banking is a business where the answer can change in a single credit cycle.