How money circulates in an economy

Money in a modern economy is constantly in motion, and the financial market is the circulatory system that keeps it flowing.

The flow in plain terms

A household earns income and saves part of it, often in a bank.
The bank lends those deposits to a business or another household, or buys securities.
The borrower spends or invests the money — building a factory, hiring people, buying equipment.
That spending becomes income for others, who save part of it, and the cycle repeats.

This circular flow is why a healthy financial system matters so much: when it works, savings are continuously recycled into productive activity.

The role of credit and interest rates

Credit lets spending happen before the money is fully earned — a mortgage, a business loan, a credit card.
Interest rates are the price of that credit. When a central bank raises rates, borrowing becomes more expensive, spending tends to cool, and inflation pressure eases. When it cuts rates, the opposite happens.

Money is more than cash

Most money in circulation is not physical notes — it is numbers in bank accounts, created largely when banks make loans. This is why confidence and regulation are so important: the whole system runs on trust that those numbers can be turned into spending and, ultimately, into real goods and services. The institutions that protect that trust are the subject of the next chapter.