Editing Stock market (section)

==Leveraged strategies==
Stock that a trader does not actually own may be traded using [[short selling]]; [[margin buying]] may be used to purchase stock with borrowed funds; or, ''[[derivative (finance)|derivatives]]'' may be used to control large blocks of stocks for a much smaller amount of money than would be required by outright purchase or sales.

===Short selling===
{{Main|Short selling}}
In short selling, the trader borrows stock (usually from his brokerage which holds its clients shares or its own shares on account to lend to short sellers) then sells it on the market, betting that the price will fall. The trader eventually buys back the stock, making money if the price fell in the meantime and losing money if it rose. Exiting a short position by buying back the stock is called "covering". This strategy may also be used by unscrupulous traders in illiquid or thinly traded markets to artificially lower the price of a stock. Hence most markets either prevent short selling or place restrictions on when and how a short sale can occur. The practice of [[naked shorting]] is illegal in most (but not all) stock markets.

===Margin buying===
{{Main|margin (finance)#Margin buying|l1=margin buying}}
In margin buying, the trader borrows money (at interest) to buy a stock and hopes for it to rise. Most industrialized countries have regulations that require that if the borrowing is based on collateral from other stocks the trader owns outright, it can be a maximum of a certain percentage of those other stocks' value. In the United States, the margin requirements have been 50% for many years (that is, if you want to make a $1000 investment, you need to put up $500, and there is often a maintenance margin below the $500).

A margin call is made if the total value of the investor's account cannot support the loss of the trade. (Upon a decline in the value of the margined securities additional funds may be required to maintain the account's equity, and with or without notice the margined security or any others within the account may be sold by the brokerage to protect its loan position. The investor is responsible for any shortfall following such forced sales.)

Regulation of margin requirements (by the [[Federal Reserve]]) was implemented after the [[Crash of 1929]]. Before that, speculators typically only needed to put up as little as 10 percent (or even less) of the total [[investment]] represented by the stocks purchased. Other rules may include the prohibition of ''free-riding:'' putting in an order to buy stocks without paying initially (there is normally a three-day grace period for delivery of the stock), but then selling them (before the three-days are up) and using part of the proceeds to make the original payment (assuming that the value of the stocks has not declined in the interim).