Introduction:
A stock market / share market is a public market (a loose network of economic transactions not a physical facility or discrete entity) for the trading of company stock and derivatives at an agreed price; these are securities listed on a stock exchange as well as those only traded privately.
The size of the world stock market was estimated at about $36.6 trillion US at the beginning of October 2008. The total world derivatives market has been estimated at about $791 trillion face or nominal value, 11 times the size of the entire world economy. The value of the derivatives market, because it is stated in terms of notional values (face values), cannot be directly compared to a stock or a fixed income security, which traditionally refers to an actual value. Moreover, the vast majority of derivatives 'cancel' each other out (i.e., a derivative 'bet' on an event occurring is offset by a comparable derivative 'bet' on the event not occurring.). Many such relatively illiquid securities are valued as marked to model, rather than an actual market price.
The stocks are listed and traded on stock exchanges which are entities of a corporation or mutual organization specialized in the business of bringing buyers and sellers of the organizations to a listing of stocks and securities together. The stock market in the United States is NYSE while in Canada, it is the Toronto Stock Exchange. Major European examples of stock exchanges include the London Stock Exchange, Paris Bourse, and the Deutsche Börse. Asian examples include the Tokyo Stock Exchange, the Hong Kong Stock Exchange,the Bombay Stock Exchange and the Karachi Stock Exchange. In Latin America, there are such exchanges as the BM&F Bovespa and the BMV.
Trading
Participants in the stock market range from small individual stock investors to large hedge fund traders, who can be based anywhere. Their orders usually end up with a professional at a stock exchange, who executes the order. Some exchanges are physical locations where transactions are carried out on a trading floor, by a method known as open outcry. This type of auction is used in stock exchanges and commodity exchanges where traders may enter "verbal" bids and offers simultaneously. The other type of stock exchange is a virtual kind, composed of a network of computers where trades are made electronically via traders. Actual trades are based on an auction market model where a potential buyer bids a specific price for a stock and a potential seller asks a specific price for the stock. (Buying or selling at market means you will accept any ask price or bid price for the stock, respectively.) When the bid and ask prices match, a sale takes place, on a first-come-first-served basis if there are multiple bidders or askers at a given price. The purpose of a stock exchange is to facilitate the exchange of securities between buyers and sellers, thus providing a marketplace (virtual or real). The exchanges provide real-time trading information on the listed securities, facilitating price discovery.
Auction Market:
An auction is a process of buying and selling goods or services by offering them up for bid, taking bids, and then selling the item to the highest bidder. In economic theory, an auction may refer to any mechanism or set of trading rules for exchange. There are several variations on the basic auction form, including time limits, minimum or maximum limits on bid prices, and special rules for determining the winning bidder(s) and sale price(s). Participants in an auction may or may not know the identities or actions of other participants. Depending on the auction, bidders may participate in person or remotely through a variety of means, including telephone and the internet. The seller usually pays a commission to the auctioneer or auction company based on a percentage of the final sale price.
Open outcry:
Open outcry is the name of a method of communication between professionals on a stock exchange or futures exchange which involves shouting and the use of hand signals to transfer information primarily about buy and sell orders.[2] The part of the trading floor where this takes place is called a pit.
Examples of markets which use this system in the United States are the New York Mercantile Exchange, the Chicago Mercantile Exchange, the Chicago Board of Trade, and the Chicago Board Options Exchange. In the United Kingdom, the London Metal Exchange still makes use of open outcry.
The open outcry system is being replaced by electronic trading systems (such as CATS and Globex). The supporters of electronic trading claim that they are faster, cheaper, more efficient for users, and less prone to manipulation by market makers and broker/dealers. However, many traders advocate for the open outcry system on the basis that the physical contact allows traders to speculate as to a buyer/seller's motives or intentions and adjust their positions accordingly.
A "trading floor" is a trading venue. This expression often refers to a place where traders or stock brokers meet in order to buy and sell equities, also called a pit. Sometimes, the expression "trading floor" is also used to refer to the "trading room" or "dealing room", i.e. the office space where market activities are concentrated in investment banks or brokerage houses. But, technically speaking, these two spaces are different.
CATS:
CATS (Computer Assisted Trading System) is an automated exchange system developed for the Toronto Stock Exchange in 1977. CATS was one of the first technologies allowing for a full automation of the price-setting process in a stock exchange. This technology was implemented in several other stock exchanges in the 1980s. In some cases, it was used as an assistance to open-outcry, but in others it allowed for a full dismantlement of the open-outcry institution. The Paris Bourse purchased this system in the early 1980s and implemented it as CAC (Cotation Assistée en Continu). CATS handled the process of order matching and price setting through a "double auction" algorithm. It is credited for having been the first system to allow for a full automation of the price setting process in a centralized, order-driven stock market.
Double auction algorithm:
A double auction is a process of buying and selling goods when potential buyers submit their bids and potential sellers simultaneously submit their ask prices to an auctioneer, and then an auctioneer chooses some price p that clears the market: all the sellers who asked less than p sell and all buyers who bid more than p buy at this price p.
Stock exchanges across the globe and types of trading:
The New York Stock Exchange is a physical exchange, also referred to as a listed exchange — only stocks listed with the exchange may be traded. Orders enter by way of exchange members and flow down to a floor broker, who goes to the floor trading post specialist for that stock to trade the order. The specialist's job is to match buy and sell orders using open outcry. If a spread exists, no trade immediately takes place--in this case the specialist should use his/her own resources (money or stock) to close the difference after his/her judged time. Once a trade has been made the details are reported on the "tape" and sent back to the brokerage firm, which then notifies the investor who placed the order. Although there is a significant amount of human contact in this process, computers play an important role, especially for so-called "program trading".
The concept of market maker in share trading:
A market maker is a company, or an individual, that quotes both a buy and a sell price in a financial instrument or commodity held in inventory, hoping to make a profit on the bid/offer spread, or turn. Most stock exchanges operate on a "matched bargain" or "order driven" basis. In such a system there are no designated or official market makers, but market makers nevertheless exist. When a buyer's bid meets a seller's offer or vice versa, the stock exchange's matching system will decide that a deal has been executed. In the United States, the New York Stock Exchange (NYSE) and American Stock Exchange (AMEX), among others, have Designated Market Makers, formerly known as "specialists", who act as the official market maker for a given security. The market makers provide a required amount of liquidity to the security's market, and take the other side of trades when there are short-term buy-and-sell-side imbalances in customer orders. This helps prevent excess volatility, and in return, the specialist is granted various informational and trade execution advantages.
How market makers make money?
A market maker makes money by buying stock at a lower price than the price at which they sell it. Note that because a market maker can take short positions, purchase and sale may be either way round - a market maker may sell stock and then buy it back later at a lower price. Therefore a market maker can make money in both rising or falling markets, as long as they correctly predict which way a stock's price will move.
Stock market makers also receive liquidity rebates from ECNs for each share that is sold to or purchased from each posted bid or offer. Conversely, a trader who takes liquidity from a bid or offer posted on an ECN is charged a fee for removing that liquidity.
The NASDAQ ("National Association of Securities Dealers Automated Quotations) is a virtual listed exchange, where all of the trading is done over a computer network. The process is similar to the New York Stock Exchange. However, buyers and sellers are electronically matched. One or more NASDAQ market makers will always provide a bid and ask price at which they will always purchase or sell 'their' stock.
The Paris Bourse, now part of Euronext, is an order-driven, electronic stock exchange. It was automated in the late 1980s. Prior to the 1980s, it consisted of an open outcry exchange. Stockbrokers met on the trading floor or the Palais Brongniart. In 1986, the CATS trading system was introduced, and the order matching process was fully automated.
Importance of stock market:
The stock market is one of the most important sources for companies to raise money. This allows businesses to be publicly traded, or raise additional capital for expansion by selling shares of ownership of the company in a public market. The liquidity that an exchange provides affords investors the ability to quickly and easily sell securities. This is an attractive feature of investing in stocks, compared to other less liquid investments such as real estate.
Liquidity in economy:
In business, economics or investment, market liquidity is an asset's ability to be sold without causing a significant movement in the price and with minimum loss of value. Money, or cash on hand, is the most liquid asset.[1] An act of exchange of a less liquid asset with a more liquid asset is called liquidation. Liquidity also refers both to a business's ability to meet its payment obligations, in terms of possessing sufficient liquid assets, and to such assets themselves.
History has shown that the price of shares and other assets is an important part of the dynamics of economic activity, and can influence or be an indicator of social mood. An economy where the stock market is on the rise is considered to be an up and coming economy. In fact, the stock market is often considered the primary indicator of a country's economic strength and development. Rising share prices, for instance, tend to be associated with increased business investment and vice versa. Share prices also affect the wealth of households and their consumption. Therefore, central banks tend to keep an eye on the control and behavior of the stock market and, in general, on the smooth operation of financial system functions.
Behavior of stock markets:
We know that investors may 'temporarily' move financial prices away from their long term aggregate price 'trends'. (Positive or up trends are referred to as bull markets; negative or down trends are referred to as bear markets.) Over-reactions may occur—so that excessive optimism (euphoria) may drive prices unduly high or excessive pessimism may drive prices unduly low. Economists continue to debate whether financial markets are 'generally' efficient.
According to one interpretation of the efficient market hypothesis (EMH), only changes in fundamental factors, such as the outlook for margins, profits or dividends, ought to affect share prices beyond the short term, where random 'noise' in the system may prevail.
According to the theory, it is not possible to consistently outperform the market by using any information that the market already has, except through insider trading. Information or news in the EMH is defined as anything that may affect prices that is unknowable in the present and thus appears randomly in the future. The hypothesis has been attacked by critics who blame the belief in rational markets for much of the financial crisis of 2007–2010, with noted financial journalist Roger Lowenstein declaring "The upside of the current Great Recession is that it could drive a stake through the heart of the academic nostrum known as the efficient-market hypothesis.
Market Crash:
A stock market crash is often defined as a sharp dip in share prices of equities listed on the stock exchanges. In parallel with various economic factors, a reason for stock market crashes is also due to panic and investing public's loss of confidence. Often, stock market crashes end speculative economic bubbles. This halt in trading allowed the Federal Reserve system and central banks of other countries to take measures to control the spreading of worldwide financial crisis. The New York Stock Exchange and the Chicago Mercantile Exchange introduced the concept of a circuit breaker. The circuit breaker halts trading if the Dow (Dow Jones Index)declines a prescribed number of points for a prescribed amount of time.
NYSE circuit breakers:
Stock market Indices:
The movements of the prices in a market or section of a market are captured in price indices called stock market indices, of which there are many, e.g., the S&P, the FTSE and the Euronext indices. Such indices are usually market capitalization weighted, with the weights reflecting the contribution of the stock to the index. The constituents of the index are reviewed frequently to include/exclude stocks in order to reflect the changing business environment.
A stock market / share market is a public market (a loose network of economic transactions not a physical facility or discrete entity) for the trading of company stock and derivatives at an agreed price; these are securities listed on a stock exchange as well as those only traded privately.
The size of the world stock market was estimated at about $36.6 trillion US at the beginning of October 2008. The total world derivatives market has been estimated at about $791 trillion face or nominal value, 11 times the size of the entire world economy. The value of the derivatives market, because it is stated in terms of notional values (face values), cannot be directly compared to a stock or a fixed income security, which traditionally refers to an actual value. Moreover, the vast majority of derivatives 'cancel' each other out (i.e., a derivative 'bet' on an event occurring is offset by a comparable derivative 'bet' on the event not occurring.). Many such relatively illiquid securities are valued as marked to model, rather than an actual market price.
The stocks are listed and traded on stock exchanges which are entities of a corporation or mutual organization specialized in the business of bringing buyers and sellers of the organizations to a listing of stocks and securities together. The stock market in the United States is NYSE while in Canada, it is the Toronto Stock Exchange. Major European examples of stock exchanges include the London Stock Exchange, Paris Bourse, and the Deutsche Börse. Asian examples include the Tokyo Stock Exchange, the Hong Kong Stock Exchange,the Bombay Stock Exchange and the Karachi Stock Exchange. In Latin America, there are such exchanges as the BM&F Bovespa and the BMV.
Trading
Participants in the stock market range from small individual stock investors to large hedge fund traders, who can be based anywhere. Their orders usually end up with a professional at a stock exchange, who executes the order. Some exchanges are physical locations where transactions are carried out on a trading floor, by a method known as open outcry. This type of auction is used in stock exchanges and commodity exchanges where traders may enter "verbal" bids and offers simultaneously. The other type of stock exchange is a virtual kind, composed of a network of computers where trades are made electronically via traders. Actual trades are based on an auction market model where a potential buyer bids a specific price for a stock and a potential seller asks a specific price for the stock. (Buying or selling at market means you will accept any ask price or bid price for the stock, respectively.) When the bid and ask prices match, a sale takes place, on a first-come-first-served basis if there are multiple bidders or askers at a given price. The purpose of a stock exchange is to facilitate the exchange of securities between buyers and sellers, thus providing a marketplace (virtual or real). The exchanges provide real-time trading information on the listed securities, facilitating price discovery.
Auction Market:
An auction is a process of buying and selling goods or services by offering them up for bid, taking bids, and then selling the item to the highest bidder. In economic theory, an auction may refer to any mechanism or set of trading rules for exchange. There are several variations on the basic auction form, including time limits, minimum or maximum limits on bid prices, and special rules for determining the winning bidder(s) and sale price(s). Participants in an auction may or may not know the identities or actions of other participants. Depending on the auction, bidders may participate in person or remotely through a variety of means, including telephone and the internet. The seller usually pays a commission to the auctioneer or auction company based on a percentage of the final sale price.
Open outcry:
Open outcry is the name of a method of communication between professionals on a stock exchange or futures exchange which involves shouting and the use of hand signals to transfer information primarily about buy and sell orders.[2] The part of the trading floor where this takes place is called a pit.
Examples of markets which use this system in the United States are the New York Mercantile Exchange, the Chicago Mercantile Exchange, the Chicago Board of Trade, and the Chicago Board Options Exchange. In the United Kingdom, the London Metal Exchange still makes use of open outcry.
The open outcry system is being replaced by electronic trading systems (such as CATS and Globex). The supporters of electronic trading claim that they are faster, cheaper, more efficient for users, and less prone to manipulation by market makers and broker/dealers. However, many traders advocate for the open outcry system on the basis that the physical contact allows traders to speculate as to a buyer/seller's motives or intentions and adjust their positions accordingly.
A "trading floor" is a trading venue. This expression often refers to a place where traders or stock brokers meet in order to buy and sell equities, also called a pit. Sometimes, the expression "trading floor" is also used to refer to the "trading room" or "dealing room", i.e. the office space where market activities are concentrated in investment banks or brokerage houses. But, technically speaking, these two spaces are different.
CATS:
CATS (Computer Assisted Trading System) is an automated exchange system developed for the Toronto Stock Exchange in 1977. CATS was one of the first technologies allowing for a full automation of the price-setting process in a stock exchange. This technology was implemented in several other stock exchanges in the 1980s. In some cases, it was used as an assistance to open-outcry, but in others it allowed for a full dismantlement of the open-outcry institution. The Paris Bourse purchased this system in the early 1980s and implemented it as CAC (Cotation Assistée en Continu). CATS handled the process of order matching and price setting through a "double auction" algorithm. It is credited for having been the first system to allow for a full automation of the price setting process in a centralized, order-driven stock market.
Double auction algorithm:
A double auction is a process of buying and selling goods when potential buyers submit their bids and potential sellers simultaneously submit their ask prices to an auctioneer, and then an auctioneer chooses some price p that clears the market: all the sellers who asked less than p sell and all buyers who bid more than p buy at this price p.
Stock exchanges across the globe and types of trading:
The New York Stock Exchange is a physical exchange, also referred to as a listed exchange — only stocks listed with the exchange may be traded. Orders enter by way of exchange members and flow down to a floor broker, who goes to the floor trading post specialist for that stock to trade the order. The specialist's job is to match buy and sell orders using open outcry. If a spread exists, no trade immediately takes place--in this case the specialist should use his/her own resources (money or stock) to close the difference after his/her judged time. Once a trade has been made the details are reported on the "tape" and sent back to the brokerage firm, which then notifies the investor who placed the order. Although there is a significant amount of human contact in this process, computers play an important role, especially for so-called "program trading".
The concept of market maker in share trading:
A market maker is a company, or an individual, that quotes both a buy and a sell price in a financial instrument or commodity held in inventory, hoping to make a profit on the bid/offer spread, or turn. Most stock exchanges operate on a "matched bargain" or "order driven" basis. In such a system there are no designated or official market makers, but market makers nevertheless exist. When a buyer's bid meets a seller's offer or vice versa, the stock exchange's matching system will decide that a deal has been executed. In the United States, the New York Stock Exchange (NYSE) and American Stock Exchange (AMEX), among others, have Designated Market Makers, formerly known as "specialists", who act as the official market maker for a given security. The market makers provide a required amount of liquidity to the security's market, and take the other side of trades when there are short-term buy-and-sell-side imbalances in customer orders. This helps prevent excess volatility, and in return, the specialist is granted various informational and trade execution advantages.
How market makers make money?
A market maker makes money by buying stock at a lower price than the price at which they sell it. Note that because a market maker can take short positions, purchase and sale may be either way round - a market maker may sell stock and then buy it back later at a lower price. Therefore a market maker can make money in both rising or falling markets, as long as they correctly predict which way a stock's price will move.
Stock market makers also receive liquidity rebates from ECNs for each share that is sold to or purchased from each posted bid or offer. Conversely, a trader who takes liquidity from a bid or offer posted on an ECN is charged a fee for removing that liquidity.
The NASDAQ ("National Association of Securities Dealers Automated Quotations) is a virtual listed exchange, where all of the trading is done over a computer network. The process is similar to the New York Stock Exchange. However, buyers and sellers are electronically matched. One or more NASDAQ market makers will always provide a bid and ask price at which they will always purchase or sell 'their' stock.
The Paris Bourse, now part of Euronext, is an order-driven, electronic stock exchange. It was automated in the late 1980s. Prior to the 1980s, it consisted of an open outcry exchange. Stockbrokers met on the trading floor or the Palais Brongniart. In 1986, the CATS trading system was introduced, and the order matching process was fully automated.
Importance of stock market:
The stock market is one of the most important sources for companies to raise money. This allows businesses to be publicly traded, or raise additional capital for expansion by selling shares of ownership of the company in a public market. The liquidity that an exchange provides affords investors the ability to quickly and easily sell securities. This is an attractive feature of investing in stocks, compared to other less liquid investments such as real estate.
Liquidity in economy:
In business, economics or investment, market liquidity is an asset's ability to be sold without causing a significant movement in the price and with minimum loss of value. Money, or cash on hand, is the most liquid asset.[1] An act of exchange of a less liquid asset with a more liquid asset is called liquidation. Liquidity also refers both to a business's ability to meet its payment obligations, in terms of possessing sufficient liquid assets, and to such assets themselves.
History has shown that the price of shares and other assets is an important part of the dynamics of economic activity, and can influence or be an indicator of social mood. An economy where the stock market is on the rise is considered to be an up and coming economy. In fact, the stock market is often considered the primary indicator of a country's economic strength and development. Rising share prices, for instance, tend to be associated with increased business investment and vice versa. Share prices also affect the wealth of households and their consumption. Therefore, central banks tend to keep an eye on the control and behavior of the stock market and, in general, on the smooth operation of financial system functions.
Behavior of stock markets:
We know that investors may 'temporarily' move financial prices away from their long term aggregate price 'trends'. (Positive or up trends are referred to as bull markets; negative or down trends are referred to as bear markets.) Over-reactions may occur—so that excessive optimism (euphoria) may drive prices unduly high or excessive pessimism may drive prices unduly low. Economists continue to debate whether financial markets are 'generally' efficient.
According to one interpretation of the efficient market hypothesis (EMH), only changes in fundamental factors, such as the outlook for margins, profits or dividends, ought to affect share prices beyond the short term, where random 'noise' in the system may prevail.
According to the theory, it is not possible to consistently outperform the market by using any information that the market already has, except through insider trading. Information or news in the EMH is defined as anything that may affect prices that is unknowable in the present and thus appears randomly in the future. The hypothesis has been attacked by critics who blame the belief in rational markets for much of the financial crisis of 2007–2010, with noted financial journalist Roger Lowenstein declaring "The upside of the current Great Recession is that it could drive a stake through the heart of the academic nostrum known as the efficient-market hypothesis.
Market Crash:
A stock market crash is often defined as a sharp dip in share prices of equities listed on the stock exchanges. In parallel with various economic factors, a reason for stock market crashes is also due to panic and investing public's loss of confidence. Often, stock market crashes end speculative economic bubbles. This halt in trading allowed the Federal Reserve system and central banks of other countries to take measures to control the spreading of worldwide financial crisis. The New York Stock Exchange and the Chicago Mercantile Exchange introduced the concept of a circuit breaker. The circuit breaker halts trading if the Dow (Dow Jones Index)declines a prescribed number of points for a prescribed amount of time.
NYSE circuit breakers:
| % drop | time of drop | | close trading for |
| 10% drop | before 2PM | | one hour halt |
| 10% drop | 2PM - 2:30PM | | half-hour halt |
| 10% drop | after 2:30PM | | market stays open |
| 20% drop | before 1PM | | halt for two hours |
| 20% drop | 1PM - 2PM | | halt for one hour |
| 20% drop | after 2PM | | close for the day |
| 30% drop | any time during day | | close for the day |
Stock market Indices:
The movements of the prices in a market or section of a market are captured in price indices called stock market indices, of which there are many, e.g., the S&P, the FTSE and the Euronext indices. Such indices are usually market capitalization weighted, with the weights reflecting the contribution of the stock to the index. The constituents of the index are reviewed frequently to include/exclude stocks in order to reflect the changing business environment.
