What the stock market actually is
Before options, futures or the Greeks: what a share is, why companies sell them, and what a market is really for.
Every options contract you will ever trade ultimately points back to one thing: a share of a company. So before we touch a single call or put, it is worth being precise about what a share is and what the market that trades it is really for.
A share is a slice of a business
When a company wants to grow — build a factory, hire, expand — it needs money. One way to raise it is to sell small ownership slices of itself to the public. Each slice is a share. Buy one and you own a tiny piece of that business: a claim on its future profits and, usually, a vote in some of its decisions.
The company gets cash today; you get part-ownership and the hope that the business becomes more valuable over time. That first sale to the public is the primary market — think of an IPO.
The market is where those slices change hands
After that first sale, shareholders need a place to buy and sell among themselves without bothering the company. That place is the secondary market — in India, exchanges like the NSE and BSE. This is what people usually mean by “the stock market.”
A working market does two quiet but essential jobs:
- Price discovery. Thousands of buyers and sellers, each with their own view, continuously negotiate a price. The last traded price is simply the level at which the most recent buyer and seller agreed.
- Liquidity. Because so many people are trading at once, you can usually convert a share back into cash quickly. Liquidity is what makes ownership practical.
Why prices move
A share’s price is not the company’s “true value” handed down from above — it is the running result of supply and demand. When more people want to buy than sell, the price drifts up; when more want out, it drifts down. Those wants are driven by everything from earnings and interest rates to news and plain sentiment.
Two ideas will carry you a long way: price reflects expectations about the future, and those expectations change constantly. That constant change — volatility — is exactly what the rest of this curriculum is about. Options are, at heart, tools for taking a view on how much and how fast a price might move, not just which direction.
Where we go from here
In the next module we introduce the options contract itself — the right, but not the obligation, to buy or sell a share at a set price by a set date — and build up from there. For now, hold on to the foundation: a share is ownership, a market is where ownership trades, and price is a live negotiation about the future.