Why the stock market exists

A stock market exists so companies can raise money and so people can later buy and sell a claim on those companies. This chapter explains that job, why idle cash loses purchasing power, and what a market still cannot promise.

Two different jobs, one marketplace

The first job is raising money. A company that wants a factory, a network, or a decade of product work can sell shares instead of borrowing the entire sum. The buyers become part-owners. They are not lenders. They do not get a fixed interest cheque. They get a claim on whatever profit and value remain after the business pays its costs, its staff, its taxes, and its lenders.

The second job is trading those claims after they already exist. Most of the volume you see on a trading screen is this second job. The company does not receive money when you buy shares from another person. You and the seller are exchanging an existing claim, at a price you both accept for that moment. The company received its money earlier, when the shares were first issued.

Both jobs need the same plumbing: a place where prices are visible, a set of rules for who may trade, and a process that actually moves shares and money. Without that plumbing, a share is only a private promise, hard to sell when you need the cash.

What happens if the surplus never leaves the cupboard

Consider Meera, who is 28. Her take-home pay is ₹72,000 a month, so ₹8,64,000 a year. She spends ₹48,000 a month, which is ₹5,76,000 a year, on rent, food, travel, and family costs. The leftover is ₹24,000 a month, or ₹2,88,000 a year. She keeps that leftover as cash. To see the shape of the problem, assume her pay rises 7% a year and her spending rises 6% a year. These are illustrations, not a forecast of her life or of inflation.

By year 10 her spending has climbed to about ₹81,100 a month. The cash pile of ₹43.5 lakh looks large next to year 1, but it covers roughly four and a half years of that later spending, and she has not yet paid for a house, a parent’s illness, or a stretch without work. The pile grew because she saved. It did not grow because the rupee in the cupboard became more useful. Each rupee buys less of the same monthly basket.

Now assume the same leftover is put, at the end of each year, into a diversified basket of businesses, and that basket compounds at 9% a year. Nine percent is an assumption for the arithmetic, not a return anyone is entitled to. Markets can lose money for years. Under that assumption the year-10 balance is about ₹62.2 lakh, not ₹43.5 lakh. The extra is not magic. It is the profit of the businesses, reinvested, minus the bad years that a smooth 9% hides. The point of the table is the gap between saving and merely storing.

Why a company sells a share at all

A founder can fund growth in four ordinary ways: reinvest profit, borrow from a bank, borrow from the bond market, or sell ownership. Reinvested profit is slow if the opportunity is large. A bank loan has a repayment date and a covenant. A bond is the same idea, sold to many lenders. A share has no repayment date. The buyer is paid only if the business does well enough to pay a dividend or to become more valuable.

That last sentence is why shares feel risky and why they have, over long stretches of history, paid more than a savings account. You are paid for taking the uncertainty that lenders refuse. You can also lose the money. A company can stagnate, dilute you with new shares, or fail. The market does not convert a weak business into a strong one. It only gives the weak business a price.

Price is a vote, not a verdict

On a given afternoon the price is the last trade between a willing buyer and a willing seller. It is not the accounting value of the machines, and it is not a promise of next year’s profit. If buyers become more eager than sellers, the price rises until the two sides meet again. If sellers become more eager, the price falls. The company may have done nothing that hour.

This is useful. A visible price lets an employee with stock options, a mutual fund, and a person saving for a child’s education all use the same number. It is also dangerous if you treat the number as information about the next week. A price can be sensible and still fall 30% because buyers change their minds about growth, interest rates, or simply about how much risk they want.

What you are actually deciding

When you invest, you decide three things, and only three. How much of this month’s surplus leaves the bank. What claim you buy with it: a business, a loan to a business or a government, a commodity, or a fund that holds those. And how long you can leave it there without needing it for rent.

The market cannot decide those for you. A higher price does not mean the decision was wise. A lower price does not mean it was foolish. The decision is wise when the claim matches the time you have, the loss you can carry, and a reason you can explain without pointing at a chart from last Tuesday.

What to remember

• Issuing shares raises money for the company. Trading existing shares does not.
• A surplus kept as cash still grows in rupees if you keep saving, and still shrinks in what it can buy.
• A share is a residual claim. You are paid after lenders, and you can lose the investment.
• A market price is the latest trade. It is not a forecast and not a guarantee.
• The worked numbers above assume a smooth 9% path. Real paths are not smooth. The illustration is there to show purchasing power, not to predict a balance.