There are two basic financial market participant distinctions, investors versus speculators and institutional versus retail. Action in financial markets by central banks is usually regarded as intervention rather than participation.
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 supply 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 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. However, the term has taken on a specific meaning in finance to describe the particular types of people and companies that regularly purchase equity or debt securities for financial gain in exchange for funding an expanding company. Less frequently the term is applied to parties who purchase real estate, currency, commodity derivatives, personal property, or other assets.
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A stock trader or equity trader or share trader, also called a stock investor, is a person or company involved in trading equity securities and attempting to profit from the purchase and sale of those securities. Stock traders may be an investor, agent, hedger, arbitrageur, speculator, or stockbroker. Such equity trading in large publicly traded companies may be through a stock exchange. Stock shares in smaller public companies may be bought and sold in over-the-counter (OTC) markets or in some instances in equity crowdfunding platforms.
An investor is a person who allocates financial capital with the expectation of a future return (profit) or to gain an advantage (interest). Through this allocated capital most of the time the investor purchases some species of property. Types of investments include equity, debt, securities, real estate, infrastructure, currency, commodity, token, derivatives such as put and call options, futures, forwards, etc. This definition makes no distinction between the investors in the primary and secondary markets.
A stockbroker is an individual or company that buys and sells stocks and other investments for a financial market participant in return for a commission, markup, or fee. In most countries they are regulated as a broker or broker-dealer and may need to hold a relevant license and may be a member of a stock exchange. They generally act as a financial advisor and investment manager. In this case they may also be licensed as a financial adviser such as a registered investment adviser (in the United States).
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