The Motley Fool

Unlike a mutual fund, it trades like a stock throughout each trading day on a stock exchange.

There are good reasons not to short stocks, though. For one thing, the company's management will be working against you, to make the business succeed.

To calculate it, multiply the current stock price by the number of shares outstanding.

Demand can fall when consumers are worried about the economy and choose to spend less and save more; overall pessimism can also lead to less spending.

Each plane an airline buys costs a lot, as does inspecting, maintaining and repairing its fleet. And each empty seat on a plane costs it money.

Stock's price per share doesn't mean what you probably think it does.

Today, though, more companies are service-oriented; high-tech companies may have lots of intangible assets, such as patents and goodwill.