Financial market in the context of Stochastic process

Commerce is the organized system of activities, functions, procedures and institutions that directly or indirectly contribute to the smooth, unhindered exchange of goods, services, and other things of value—predominantly through transactional processes—at the right time, place, quantity, quality and price through various channels among the original producers and the final consumers within local, regional, national or international economies. The diversity in the distribution of natural resources, differences of human needs and wants, and division of labour along with comparative advantage are the principal factors that give rise to commercial exchanges.

Commerce consists of trade and aids to trade (i.e. auxiliary commercial services) taking place along the entire supply chain. Trade is the exchange of goods (including raw materials, intermediate and finished goods) and services between buyers and sellers in return for an agreed-upon price at traditional (or online) marketplaces. It is categorized into domestic trade, including retail and wholesale as well as local, regional, inter-regional and international/foreign trade (encompassing import, export and entrepôt/re-export trades). The exchange of currencies (in foreign exchange markets), commodities (in commodity markets/exchanges) and securities and derivatives (in stock exchanges and financial markets) in specialized exchange markets, typically operating under the domain of finance and investment, also falls under the umbrella of trade. On the other hand, auxiliary commercial activities (aids to trade) which can facilitate trade include commercial intermediaries, banking, credit financing and related services, transportation, packaging, warehousing, communication, advertising and insurance. Their purpose is to remove hindrances related to direct personal contact, payments, savings, funding, separation of place and time, product protection and preservation, knowledge and risk.

A regulated market (RM) or coordinated market is an idealized system where the government or other organizations oversee the market, control the forces of supply and demand, and to some extent regulate the market actions. This can include tasks such as determining who is allowed to enter the market and what prices may be charged. The majority of financial markets such as stock exchanges are regulated, whereas over-the-counter markets are usually not at all or only moderately regulated.

One of the reasons for regulation can be the importance of the regulated activity – meaning the harm suffered should the industry fail would be so fatal that regulators (governments, legislators) cannot afford the risk. This includes fields like banking or financial services. Secondly, it is common for some markets to be regulated under the claim that they are natural monopolies, or that a monopoly would very likely appear should there be no regulation. It is crucial to prevent misuse of monopoly power, as this can lead to delivery of poor services with very high prices. This includes for example the telecommunications, water, gas, or electricity supply. Often, regulated markets are established during the partial privatisation of government controlled utility assets.

Wall Street is a street in the Financial District of Lower Manhattan in New York City. It runs eight city blocks between Broadway in the west and South Street and the East River in the east with a length of just under 2,000 feet. The term "Wall Street" has become a metonym for the financial markets of the United States as a whole, the American financial services industry, New York–based financial interests, or the Financial District. Anchored by Wall Street, New York has been described as the world's principal fintech and financial center.

The street was originally known in Dutch as Het Cingel ("the Belt") when it was part of New Amsterdam during the 17th century. An actual city wall existed on the street from 1653 to 1699. During the 18th century, the location served as a slave market and securities trading site, and from 1703 onward, the location of New York's city hall, which became Federal Hall. In the early 19th century, both residences and businesses occupied the area, but increasingly the latter predominated, and New York's financial industry became centered on Wall Street. During the 20th century, several early skyscrapers were built on Wall Street, including 40 Wall Street, once the world's tallest building. The street is near multiple subway stations and ferry terminals.

A financial intermediary is an institution or individual that serves as a middleman between two or more parties, typically a lender and borrower, in order to facilitate financial transactions. Common types include commercial banks, investment banks, stockbrokers, insurance and pension funds, pooled investment funds, leasing companies, and stock exchanges.

When the money is lent directly via the financial markets, eliminating the financial intermediary, the converse process of financial disintermediation occurs.

Cash is money in the physical form of currency, such as banknotes and coins.

In book-keeping and financial accounting, cash is current assets comprising currency or currency equivalents that can be accessed immediately or near-immediately (as in the case of money market accounts). Cash is seen either as a reserve for payments, in case of a structural or incidental negative cash flow, or as a way to avoid a downturn on financial markets.

The spot market or cash market is a public financial market in which financial instruments or commodities are traded for immediate delivery. It contrasts with a futures market, in which delivery is due at a later date. In a spot market, settlement normally happens in T+2 working days, i.e., delivery of cash and commodity must be done after two working days of the trade date. A spot market can be through an exchange or over-the-counter (OTC). Spot markets can operate wherever the infrastructure exists to conduct the transaction.

In probability theory and related fields, a stochastic (/stəˈkæstɪk/) or random process is a mathematical object usually defined as a family of random variables in a probability space, where the index of the family often has the interpretation of time. Stochastic processes are widely used as mathematical models of systems and phenomena that appear to vary in a random manner. Examples include the growth of a bacterial population, an electrical current fluctuating due to thermal noise, or the movement of a gas molecule. Stochastic processes have applications in many disciplines such as biology, chemistry, ecology, neuroscience, physics, image processing, signal processing, control theory, information theory, computer science, and telecommunications. Furthermore, seemingly random changes in financial markets have motivated the extensive use of stochastic processes in finance.

Applications and the study of phenomena have in turn inspired the proposal of new stochastic processes. Examples of such stochastic processes include the Wiener process or Brownian motion process, used by Louis Bachelier to study price changes on the Paris Bourse, and the Poisson process, used by A. K. Erlang to study the number of phone calls occurring in a certain period of time. These two stochastic processes are considered the most important and central in the theory of stochastic processes, and were invented repeatedly and independently, both before and after Bachelier and Erlang, in different settings and countries.

Financial contagion refers to "the spread of market disturbances—mostly on the downside—from one country to the other, a process observed through co-movements in exchange rates, stock prices, sovereign spreads, and capital flows". Financial contagion can be a potential risk for countries who are trying to integrate their financial system with international financial markets and institutions. It helps explain an economic crisis extending across neighboring countries, or even regions.

Financial contagion happens at both the international level and the domestic level. At the domestic level, usually the failure of a domestic bank or financial intermediary triggers transmission when it defaults on interbank liabilities and sells assets in a fire sale, thereby undermining confidence in similar banks.An example of this phenomenon is the subsequent turmoil in the United States financial markets. International financial contagion, which happens in both advanced economies and developing economies, is the transmission of financial crisis across financial markets for direct or indirect economies. However, under today's financial system, with the large volume of cash flow, such as hedge fund and cross-regional operation of large banks, financial contagion usually happens simultaneously both among domestic institutions and across countries. The cause of financial contagion usually is beyond the explanation of real economy, such as the bilateral trade volume.

A capital market is a financial market in which long-term debt (over a year) or equity-backed securities are bought and sold, in contrast to a money market where short-term debt is bought and sold. Capital markets channel the wealth of savers to those who can put it to long-term productive use, such as companies or governments making long-term investments. Financial regulators like Securities and Exchange Board of India (SEBI), Bank of England (BoE) and the U.S. Securities and Exchange Commission (SEC) oversee capital markets to protect investors against fraud, among other duties.

Transactions on capital markets are generally managed by entities within the financial sector or the treasury departments of governments and corporations, but some can be accessed directly by the public. As an example, in the United States, any American citizen with an internet connection can create an account with TreasuryDirect and use it to buy bonds in the primary market. However, sales to individuals form only a small fraction of the total volume of bonds sold. Various private companies provide browser-based platforms that allow individuals to buy shares and sometimes even bonds in the secondary markets. There are many thousands of such systems, most serving only small parts of the overall capital markets. Entities hosting the systems include investment banks, stock exchanges and government departments. Physically, the systems are hosted all over the world, though they tend to be concentrated in financial centres like London, New York, and Hong Kong.

An exchange rate regime is a way a monetary authority of a country or currency union manages the currency about other currencies and the foreign exchange market. It is closely related to monetary policy and the two are generally dependent on many of the same factors, such as economic scale and openness, inflation rate, the elasticity of the labor market, financial market development, and capital mobility.

There is no correct or optimal exchange rate. However, the exchange rate has distributional consequences with winners and losers in the domestic economy. Exporters and importers lose with currency appreciation while consumers and domestic oriented industries benefit from currency appreciation. A currency depreciation has the opposite effect.

The bond market (also debt market or credit market) is a financial market in which participants can issue new debt, known as the primary market, or buy and sell debt securities, known as the secondary market. This is usually in the form of bonds, but it may include notes, bills, and so on for public and private expenditures. The bond market has largely been dominated by the United States, which accounts for about 39% of the market. In 2021, the size of the bond market (total debt outstanding) was estimated to be $119 trillion worldwide and $46 trillion for the US market, according to the Securities Industry and Financial Markets Association (SIFMA).

Bonds and bank loans form what is known as the credit market. The global credit market in aggregate is about three times the size of the global equity market. Bank loans are not securities under the U.S. Securities and Exchange Act, but bonds typically are and are therefore more highly regulated. Bonds are typically not secured by collateral (although they can be), and are sold in relatively small denominations of around $1,000 to $10,000. Unlike bank loans, bonds may be held by retail investors. Bonds are more frequently traded than loans, although not as often as equity.

The money market is a component of the economy that provides short-term funds. The money market deals in short-term loans, generally for a period of a year or less.

As short-term securities became a commodity, the money market became a component of the financial market for assets involved in short-term borrowing, lending, buying and selling with original maturities of one year or less. Trading in money markets is done over the counter and is wholesale.

Financial economics is the branch of economics characterized by a "concentration on monetary activities", in which "money of one type or another is likely to appear on both sides of a trade". Its concern is thus the interrelation of financial variables, such as share prices, interest rates and exchange rates, as opposed to those concerning the real economy. It has two main areas of focus: asset pricing and corporate finance; the first being the perspective of providers of capital, i.e. investors, and the second of users of capital.It thus provides the theoretical underpinning for much of finance.

The subject is concerned with "the allocation and deployment of economic resources, both spatially and across time, in an uncertain environment". It therefore centers on decision making under uncertainty in the context of the financial markets, and the resultant economic and financial models and principles, and is concerned with deriving testable or policy implications from acceptable assumptions. It thus also includes a formal study of the financial markets themselves, especially market microstructure and market regulation.It is built on the foundations of microeconomics and decision theory.

A regulated market (RM) or coordinated market is an idealized system where the government or other organizations oversee the market, control the forces of supply and demand, and to some extent regulate the market actions. This can include tasks such as determining who is allowed to enter the market and what prices may be charged. The majority of financial markets such as stock exchanges are regulated, whereas over-the-counter markets are usually not at all or only moderately regulated.

A variety of forms of regulations exist in a regulated market. These include controls, oversights, anti-discrimination, environmental protection, taxation, and labor laws.

Food speculation refers to the buying and selling of futures contracts or other commodity derivatives by traders with the aim of profiting from changes in food prices. Food speculation can be both positive and negative for food producers and buyers. It is betting on food prices in financial markets.

Food speculation by global players like banks, hedge funds or pension funds is alleged to cause price swings in staple foods such as wheat, maize and soy – even though too large price swings in an idealized economy are theoretically ruled out: Adam Smith in 1776 reasoned that the only way to make money from commodities trading is by buying low and selling high, which has the effect of smoothing out price swings and mitigating shortages. For the actors, the apparently random swings are predictable, which means potential huge profits. For the global poor, food speculation and resulting price peaks may result in increased poverty or even famine.