Banks, in classroom words

A commercial bank, in classroom words, is a shop that takes deposits and makes loans. The depositor has a claim on the bank. The borrower owes the bank. The bank lives in the middle with a license, a supervisor, and a stack of rules. That is a business. It is not a candlestick, and it is not this classroom.

Interest is rent on waiting. The bank often pays a smaller rent on deposits and charges a larger rent on loans. The gap is a spread. Spreads pay staff, buildings, bad loans, and — if anything is left — equity. A fat spread is not a moral grade. A thin spread is not a coupon you paper-buy because a thread said “banks are cheap.”

People also say “bank” when they mean an investment bank: a shop that helps a firm sell new claims, advises on a merger, or trades as principal. That is a different license in many countries, and a different job even when the logo is the same. Mixing the two is how a deposit ad becomes an underwriting story.

Human: if you cannot say what the shop does without saying a ticker, you are still looking at a sticker. Sit with the job. Boring is allowed. Passing this path is not a banking license. Look. Do not buy. Not a bank.