There are two basic financial market participant categories, Investor

Investor

An investor is a party that makes an investment into one or more categories of assets --- equity, debt securities, real estate, currency, commodity, derivatives such as put and call options, etc...

 vs. Speculator and Institutional vs. Retail

Retail

Retail consists of the sale of physical goods or merchandise from a fixed location, such as a department store, boutique or kiosk, or by mail, in small or individual lots for direct consumption by the purchaser. Retailing may include subordinated services, such as delivery. Purchasers may be...

. Action in financial markets by central banks is usually regarded as intervention rather than participation.

Supply Side vs. Demand Side

A market participant may either be coming from the Supply Side, hence supplying excess money (in the form of investments) in favor of the demand side; or coming from the Demand Side, hence demanding excess money (in the form of borrowed equity) in favor of the Demand Side. This equation originated from Keynesian Advocates. The theory explains that a given market may have excess cash; hence the supplier of funds may lend it; and those in need of cash may borrow the funds as supplied. Hence, the equation: aggregate savings equals aggregate investments.

The demand side consists of: those in need of cash flows (daily operational needs); those in need of interim financing (bridge financing); those in need of long-term funds for special projects (capital funds for venture financing).

The supply side consists of: those who have aggregate savings (retirement funds, pension funds, insurance funds) that can be used in favor of demand side. The origin of the savings (funds) can be local savings or foreign savings. So much pensions or savings can be invested for school buildings; orphanages; (but not earning) or for road network (toll ways) or port development (capable of earnings).

The earnings go to owner (Savers or Lenders) and the margin goes to the banks. When the principal and interest are added up, it will reflect the amount paid for the user (borrower) of the funds. Thus, an interest percentage for the cost of using the funds.

Investor

An investor is any party that makes an Investment

Investment

Investment has different meanings in finance and economics. Finance investment is putting money into something with the expectation of gain, that upon thorough analysis, has a high degree of security for the principal amount, as well as security of return, within an expected period of time...

.

However, the term has taken on a specific meaning in finance

Finance

"Finance" is often defined simply as the management of money or “funds” management Modern finance, however, is a family of business activity that includes the origination, marketing, and management of cash and money surrogates through a variety of capital accounts, instruments, and markets created...

 to describe the particular types of people and companies that regularly purchase equity

Stock

The capital stock of a business entity represents the original capital paid into or invested in the business by its founders. It serves as a security for the creditors of a business since it cannot be withdrawn to the detriment of the creditors...

 or debt

Bond (finance)

In finance, a bond is a debt security, in which the authorized issuer owes the holders a debt and, depending on the terms of the bond, is obliged to pay interest to use and/or to repay the principal at a later date, termed maturity...

 securities

Security (finance)

A security is generally a fungible, negotiable financial instrument representing financial value. Securities are broadly categorized into:* debt securities ,* equity securities, e.g., common stocks; and,...

 for financial gain in exchange for funding

Funding

Funding is the act of providing resources, usually in form of money , or other values such as effort or time , for a project, a person, a business or any other private or public institutions...

 an expanding company. Less frequently the term is applied to parties who purchase real estate

Real estate

In general use, esp. North American, 'real estate' is taken to mean "Property consisting of land and the buildings on it, along with its natural resources such as crops, minerals, or water; immovable property of this nature; an interest vested in this; an item of real property; buildings or...

, currency

Currency

In economics, currency refers to a generally accepted medium of exchange. These are usually the coins and banknotes of a particular government, which comprise the physical aspects of a nation's money supply...

, commodity

Commodity

In economics, a commodity is the generic term for any marketable item produced to satisfy wants or needs. Economic commodities comprise goods and services....

 derivatives

Derivative (finance)

A derivative instrument is a contract between two parties that specifies conditions—in particular, dates and the resulting values of the underlying variables—under which payments, or payoffs, are to be made between the parties.Under U.S...

, personal property

Personal property

Personal property, roughly speaking, is private property that is moveable, as opposed to real property or real estate. In the common law systems personal property may also be called chattels or personalty. In the civil law systems personal property is often called movable property or movables - any...

, or other assets.

Speculation

Speculation, in the narrow sense of financial speculation, involves the buying, holding, selling, and short-selling

Trade

Trade is the transfer of ownership of goods and services from one person or entity to another. Trade is sometimes loosely called commerce or financial transaction or barter. A network that allows trade is called a market. The original form of trade was barter, the direct exchange of goods and...

 of stock

Stock

The capital stock of a business entity represents the original capital paid into or invested in the business by its founders. It serves as a security for the creditors of a business since it cannot be withdrawn to the detriment of the creditors...

s, bonds

Bond (finance)

In finance, a bond is a debt security, in which the authorized issuer owes the holders a debt and, depending on the terms of the bond, is obliged to pay interest to use and/or to repay the principal at a later date, termed maturity...

, commodities

Commodity

In economics, a commodity is the generic term for any marketable item produced to satisfy wants or needs. Economic commodities comprise goods and services....

, currencies

Currency

In economics, currency refers to a generally accepted medium of exchange. These are usually the coins and banknotes of a particular government, which comprise the physical aspects of a nation's money supply...

, collectible

Collectible

A collectable or collectible is any object regarded as being of value or interest to a collector . There are numerous types of collectables and terms to denote those types. An antique is a collectable that is old...

s, real estate

Real estate

In general use, esp. North American, 'real estate' is taken to mean "Property consisting of land and the buildings on it, along with its natural resources such as crops, minerals, or water; immovable property of this nature; an interest vested in this; an item of real property; buildings or...

, derivatives

Derivative (finance)

A derivative instrument is a contract between two parties that specifies conditions—in particular, dates and the resulting values of the underlying variables—under which payments, or payoffs, are to be made between the parties.Under U.S...

 or any valuable financial instrument to profit from fluctuations in its price as opposed to buying it for use or for income via methods such as dividend

Dividend

Dividends are payments made by a corporation to its shareholder members. It is the portion of corporate profits paid out to stockholders. When a corporation earns a profit or surplus, that money can be put to two uses: it can either be re-invested in the business , or it can be distributed to...

s or interest

Interest

Interest is a fee paid by a borrower of assets to the owner as a form of compensation for the use of the assets. It is most commonly the price paid for the use of borrowed money, or money earned by deposited funds....

. Speculation or agiotage represents one of three market

Market

A market is one of many varieties of systems, institutions, procedures, social relations and infrastructures whereby parties engage in exchange. While parties may exchange goods and services by barter, most markets rely on sellers offering their goods or services in exchange for money from buyers...

 roles in western financial markets, distinct from hedging

Hedge (finance)

A hedge is an investment position intended to offset potential losses that may be incurred by a companion investment.A hedge can be constructed from many types of financial instruments, including stocks, exchange-traded funds, insurance, forward contracts, swaps, options, many types of...

, long term investing and arbitrage

Arbitrage

In economics and finance, arbitrage is the practice of taking advantage of a price difference between two or more markets: striking a combination of matching deals that capitalize upon the imbalance, the profit being the difference between the market prices...

. Speculators in an asset may have no intention to have long term exposure to that asset.

Institutional investor

An institutional investor is an investor, such as a bank, insurance company, retirement fund, hedge fund, or mutual fund, that is financially sophisticated and makes large investments, often held in very large portfolios of investments. Because of their sophistication, institutional investors may often participate in private placements of securities, in which certain aspects of the securities laws may be inapplicable.

Retail investor

A retail investor is an individual investor possessing shares of a given security. Retail investors can be further divided into two categories of share ownership.

1. A Beneficial Shareholder is a retail investor who holds shares of their securities in the account of a bank or broker, also known as “in Street Name.” The broker is in possession of the securities on behalf of the underlying shareholder.
2. A Registered Shareholder is a retail investor who holds shares of their securities directly through the issuer or its transfer agent. Many registered shareholders have physical copies of their stock certificates.

In the United States, as of 2005 about 57 million households owned stocks, and in total individual investors owned 26% of equities.