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Par value is a nominal value of a security which is determined by an issuer company at a minimum price. Par value of an equity (a stock) is a somewhat archaic concept. The par value of a stock was the share price upon initial offering; the issuing company promised not to issue further shares below par value, so investors could be confident that no one else was receiving a more favorable issue price. This was far more important in unregulated equity markets than in the regulated markets that exist today.
Most common stocks issued today do not have par values; those that do (usually only in jurisdictions where par values are required by law) have extremely low par values (often the smallest unit of currency commonly used), for example a penny par value on a stock issued at USD$25/share.
No-par stocks have no par value printed on its certificates. Instead of par value, some U.S. states allow no-par stocks to have a stated value, set by the board of directors of the corporation, which serves the same purpose as par value in setting the minimum legal capital that the corporation must have after paying any dividends or buying back its stock.
Preferred stock par value remains relevant, and tends to reflect issue price. Dividends on preferred stocks are calculated as a percentage of par value.
Also, par value still matters for a callable common stock: the call price is usually either par value or a small fixed percentage over par value.
In the United States, it is legal for a corporation to issue "watered" shares below par value. However, the purchasers of "watered" shares incur an accounting liability to the corporation for the difference between the par value and the price they paid. Today, in many jurisdictions, par values are no longer required for common stocks.
2007-05-13 06:10:03 補充：
簡單d黎講....票面價值(Par Value)只係作為記賬之用, 但係與公司股份之實際價值並無關係。Source(s): http://en.wikipedia.org/wiki/Par_value