Stock is an equity investment that represents part ownership in a corporation and entitles you to part of that corporation's earnings and assets.
Common stock gives shareholders voting rights but no guarantee of dividend payments. Preferred stock provides no voting rights but usually guarantees a dividend payment.
In the past, shareholders received a paper stock certificate -- called a security -- verifying the number of shares they owned. Today, share ownership is usually recorded electronically, and the shares are held in street name by your brokerage firm.
The rate at which firms accumulate and deplete their stocks influences (see STOCK CONTROL) the oscillations in economic activity (see BUSINESS CYCLE). Although the increase and decrease in stocks operates on the same ACCELERATOR principle as capital investment, the decision as to what level of stock to hold may not be entirely in the businessman's hands. Involuntary investment may occur when demand turns out to be less than a producer's expectations so that stock builds up during downturns in the business cycle (see INVENTORY INVESTMENT).