Industry WIKI

Student debt refers to the debt incurred by an individual to pay for education-related expenses. This debt is most commonly assumed to pay for tertiary education, such as university.

A student loan is a type of loan designed to help students pay for tertiary education and the associated fees, such as tuition, books and supplies, and living expenses. It may differ from other types of loans in the fact that the interest rate may be substantially lower and the repayment schedule may be deferred while the student is still in school. It also differs in many countries in t

The American subprime mortgage crisis was a multinational financial crisis that occurred between 2007 and 2010, contributing to the 2008 financial crisis. It led to a severe economic recession, with millions becoming unemployed and many businesses going bankrupt. The U.S. government intervened with a series of measures to stabilize the financial system, including the Troubled Asset Relie

A payment surcharge, also known as checkout fee, is an extra fee charged by a merchant when receiving a payment by cheque, credit card, charge card, debit card or an e-money account, but not cash, which at least covers the cost to the merchant of accepting that means of payment, such as the merchant service fee imposed by a credit card company. Retailers generally incur higher costs when

In financial regulation, a suspicious activity report (SAR) or suspicious transaction report (STR) is a report made by a financial institution about suspicious or potentially suspicious activity as required under laws designed to counter money laundering, financing of terrorism and other financial crimes. The criteria for when a report is required vary by country, but in general, a repor

A swap execution facility (SEF) (sometimes swaps execution facility) is a platform for financial swap trading that provides pre-trade information (i.e. bid and offer prices) and a mechanism for executing swap transactions among eligible participants.

Swift v. Tyson, 41 U.S. (16 Pet.) 1 (1842), was a case brought in diversity in the Circuit Court for the Southern District of New York on a bill of exchange accepted in New York in which the Supreme Court of the United States determined that United States federal courts that heard cases brought under their diversity jurisdiction under the Judiciary Act of 1789 must apply statutory state

A swing producer or swing supplier is a supplier or a close oligopolistic group of suppliers of any commodity, controlling its global deposits and possessing large spare production capacity. A swing producer is able to increase or decrease commodity supply at minimal additional internal cost, and thus able to influence prices and balance the markets, providing downside protection in the

In finance, a synthetic position is a way to create the payoff of a financial instrument using other financial instruments.

In finance, systemic risk is the risk of collapse of an entire financial system or entire market, as opposed to the risk associated with any one individual entity, group or component of a system, that can be contained therein without harming the entire system. It can be defined as "financial system instability, potentially catastrophic, caused or exacerbated by idiosyncratic events or co

A systemically important financial institution (SIFI) is a bank, insurance company, or other financial institution whose failure might trigger a financial crisis. They are colloquially referred to as "too big to fail".

Systemically important financial market utilities (SIFMUs) are entities whose failure or disruption could threaten the stability of the United States financial system. To date eight entities in the U.S. have been officially designated SIFMUs.

Tag-along rights (TARs) comprise a group of clauses in a contract which together have the effect of allowing the minority shareholder(s) in a corporation to also take part in a sale of shares by the majority shareholder to a third party under the same terms and conditions.

The Taiwan Futures Exchange (TAIFEX; Chinese: 臺灣期貨交易所; pinyin: Táiwān Qíhuò Jiāoyì Suǒ; Pe̍h-ōe-jī: Tâi-oân Kî-hòe Kau-e̍k-só͘) was established in 1998. It offers futures and options on major Taiwan stock indices, government bond futures, equity options and 30-day CP interest rate futures.

Tarjeta bip! ("bip! card") is the contactless payment method used in the public transportation system of Red Metropolitana de Movilidad in the metropolitan region of Santiago, Chile.

A tax haven is a term, often used pejoratively, to describe a place with very low tax rates for non-domiciled investors, even if the official rates may be higher.

In Algeria, the most important sources of government revenue have been oil and gas royalties.

Taxpayers' money or taxpayer dollars is a phrase that supposes government spending is dispersed from an aggregation of tax revenues, and emphasises a putative cohort of taxpayers from whom said revenue is collected. The phrase is associated with Margaret Thatcher, who asserted in 1983 that "the state has no source of money, other than the money people earn themselves. If the state wishes

The Taylor rule is a monetary policy targeting rule. The rule was proposed in 1992 by American economist John B. Taylor for central banks to use to stabilize economic activity by appropriately setting short-term interest rates. The rule considers the federal funds rate, the price level and changes in real income. The Taylor rule computes the optimal federal funds rate based on the gap be

The TED spread is the difference between the interest rates on interbank loans and on short-term U.S. government debt ("T-bills"). TED is an acronym formed from T-Bill and ED, the ticker symbol for the Eurodollar futures contract.

Tellus App, Inc. (d.b.a. Tellus, previously known as Zilly, Inc.) is an American real estate technology and financial technology company. The company's primary product, an eponymous app, provides a property management and payment system for use in housing rentals, and offers non-FDIC-insured cash accounts targeted at general consumers.

Under the provisions of the United Kingdom Housing Act 2004 every landlord or letting agent that takes a deposit for an assured shorthold tenancy in England and Wales must protect the deposit under an authorised tenancy deposit scheme. The regulations came into effect on 6 April 2007, and were amended by the Localism Act 2011 (taking effect from 6 April 2012) and the Deregulation Act 201

Tez was a mobile payments service by Google, targeted at users in India, later folded into the new Google Pay app on 28 August 2018. It operated atop the Unified Payments Interface, developed by the National Payments Corporation of India. The product was created as part of Google's Next Billion Users initiative led by Caesar Sengupta, former vice president and general manager, Payments &

The Cluetrain Manifesto is a work of business literature collaboratively authored by Rick Levine, Christopher Locke, Doc Searls, and David Weinberger. It was first posted to the web in 1999 as a set of ninety-five theses, and was published as a book in 2000 with the theses extended by seven essays. The work examines the impact of the Internet on marketing, claiming that conventional mark

"The Market for 'Lemons': Quality Uncertainty and the Market Mechanism" is a widely cited seminal paper in the field of economics which explores the concept of asymmetric information in markets. The paper was written in 1970 by George Akerlof and published in the Quarterly Journal of Economics. The paper's theory has since been applied to many types of markets.

In economics, the paradox of banknotes or cash paradox is the observation that while the share of cash transactions has fallen over the past few decades due to alternative forms of payment such as credit cards and other electronic payment instruments, the demand for physical currency, measured as the ratio of currency in circulation (CIC) to GDP, has been steadily increasing since the ea

The Security Printing Corporation (Bangladesh) Ltd. (SPCBL; Bengali: দি সিকিউরিটি প্রিন্টিং কর্পোরেশন (বাংলাদেশ) লিমিটেড) is the main printer of banknotes and government postal stamps in Bangladesh.

Thomas Henry Greco Jr. (October 9, 1936 – June 15, 2026) was an American community economist, who wrote and consulted on monetary exchange alternatives, including private credit clearing systems, complementary currencies and local currencies.

Ticker tape was the earliest electrical dedicated financial communications medium, transmitting stock price information over telegraph lines, in use from around 1870 to 1970. It consisted of a paper strip that ran through a machine called a stock ticker, which printed abbreviated company names as alphabetic symbols followed by numeric stock transaction price and volume information. The t

TikTok Shop is an e-commerce feature of the video hosting service TikTok. Officially launched in September 2023, the feature enables users interested in starting a business and generating income to upload their curated products on TikTok for others to discover and purchase. Daily sales averaged approximately US$7 million in October 2023.As of October 2026, it has been estimated that 54 m

Tobin's q (or the q ratio, and Marris's v), is the ratio between a physical asset's market value and its replacement cost. It was first introduced by Robin Marris as a firm-level microeconomic variable in his 1964 book The Economic Theory of Managerial Capitalism, and was shortly afterwards further analysed by Richard Kahn in early drafts of his paper Notes on the Rate of Interest and th

In numismatics, token coins or trade tokens are coin-like objects used instead of coins. The field of token coins is part of exonumia and token coins are token money. Their denomination is shown or implied by size, color or shape. They are often made of cheaper metals like copper, pewter, aluminium, brass and tin, or non-metals like bakelite, leather and porcelain.

Tom Clancy's Ghost Recon Breakpoint is an online tactical shooter video game developed by Ubisoft Paris and published by Ubisoft. The game was released worldwide on 4 October 2019 for PlayStation 4, Windows, and Xbox One, and on 18 December 2019 for Stadia. The game is the eleventh installment in the Tom Clancy's Ghost Recon franchise and is a narrative sequel to the 2017 video game Tom

"Too big to fail" (TBTF) is a theory in banking and finance that asserts that certain corporations, particularly financial institutions, are so large and so interconnected with an economy that their failure would be disastrous to the greater economic system, and therefore should be supported by government when they face potential failure. The colloquial term "too big to fail" was popular

Tornado Cash (also stylized as TornadoCash) is an open source, non-custodial, fully decentralized cryptocurrency tumbler that runs on Ethereum Virtual Machine-compatible networks. It offers a service that mixes potentially identifiable or "tainted" cryptocurrency funds with others, so as to obscure the trail back to the fund's original source. This is a privacy tool used in EVM networks

The Toronto Computer Leasing Inquiry was a judicial inquiry into allegations of conflict of interest, bribery and misappropriation of funds around computer leasing contracts entered into by the City of Toronto government in 1998 and 1999. It was held concurrently with the Toronto External Contracts Inquiry.

In insurance claims, a total loss or write-off is a situation where the lost value, repair cost or salvage cost of a damaged property exceeds its insured value, and simply replacing the old property with a new equivalent is more cost-effective.

In finance, a total return swap (TRS), total rate of return swap (TRORS), or cash-settled equity swap is a financial contract that transfers both the credit risk and market risk of an underlying asset.

TP ICAP Group plc is a financial services firm headquartered in London, United Kingdom. Its stock is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.

Trade credit insurance, business credit insurance, export credit insurance, or credit insurance is a type of insurance policy and a risk management product offered by private insurance companies and governmental export credit agencies to business entities wishing to protect their accounts receivable from loss due to credit risks such as protracted default, insolvency or bankruptcy. This

Trade finance technology (abbreviated TradeTech, tradetech, or sometimes Trade Tech) refers to the use of technology, innovation, and software to support and digitally transform the trade finance industry. TradeTech can be seen as a subcategory under FinTech. As digital information becomes more readily accessible, convenient, and available, the trade finance industry is being gradually m

In structured finance, a tranche (French pronunciation: [tʁɑ̃ʃ]) is one of a number of related securities offered as part of the same transaction. In the financial sense of the word, each bond is a different slice of the deal's risk. Transaction documentation (see indenture) usually defines the tranches as different "classes" of notes, each identified by letter (e.g., the Class A, Class

A transaction account (also called a checking account, cheque account, chequing account, current account, demand deposit account, or share account at credit unions) is a deposit account or bank account held at a bank or other financial institution. It is available to the account owner "on demand" and is available for frequent and immediate access by the account owner or to others as the

A traveller's cheque is a medium of exchange that can be used in place of the currency of a country. Each cheque is denominated in a preprinted fixed, round, amount of one of a number of major world currencies; it has two panels for a signature. The purchaser signs one panel of each cheque on receiving it; to use it, it is signed on the second panel and dated in the presence of the payee

A treasury is either:

The Department of the Treasury, also known as the Treasury, is the national treasury and financial department of the federal government of Australia. The treasury is responsible for executing economic and fiscal policy, market regulation and the delivery of the federal budget with the department overseeing 16 agencies. The Treasury is one of only two departments that have existed contin

The House of Commons Treasury Committee (often referred to as the Treasury Select Committee) is a select committee of the House of Commons in the Parliament of the United Kingdom. The committee is responsible for examining and scrutinizing the expenditure, administration and policy of HM Treasury. This includes its agencies and associated bodies, including HM Revenue and Customs, the Ba

In finance, the Treynor reward-to-volatility model (sometimes called the reward-to-volatility ratio or Treynor measure), named after American economist Jack L. Treynor, is a measurement of the returns earned in excess of that which could have been earned on an investment that has no risk that can be diversified (e.g., Treasury bills or a completely diversified portfolio), per unit of mar

In international finance, the Triffin dilemma (sometimes the Triffin paradox) is the conflict of economic interests that arises between short-term domestic and long-term international objectives for countries whose currencies serve as global reserve currencies. This dilemma was identified in the 1960s by Belgian-American economist Robert Triffin. He noted that a country whose currency i

The trinomial tree is a lattice-based computational model used in financial mathematics to price options on equity. It was developed by Phelim Boyle in 1986. It is an extension of the binomial options pricing model, and is conceptually similar. It can also be shown that the approach is equivalent to the explicit finite difference method for option pricing.

The Troubled Asset Relief Program (TARP) is a program of the United States government to purchase toxic assets and equity from financial institutions to strengthen its financial sector that was passed by Congress and signed into law by President George W. Bush. It was a component of the government's measures in 2008 to address the subprime mortgage crisis.

Trusted Shops is a company founded in Cologne, Germany, in 1999, which offers online shops and their customers trust-building services by means of a trustmark, a money-back guarantee process and a system of customer reviews. Online retailers are also provided with assistance in meeting legal requirements. Around 25,000 online shops display the trustmark as of July 2019.

Total System Services, Inc. (TSYS) is an American financial technology company based in Columbus, Georgia, that provides payment processing services, merchant services and related payment services. It also provides reloadable prepaid debit cards and payroll cards, and demand deposit accounts to the underbanked.

A turbo warrant (or callable bull/bear contract) is a kind of stock option. Specifically, it is a barrier option of the down and out type. It is similar to a vanilla contract, but with two additional features: It has a low vega, meaning that the option price is much less affected by the implied volatility of the stock market, and it is highly geared due to the possibility of knockout. Th

The Tuvaluan dollar is one of the currencies of Tuvalu, whose unofficial international currency code is TVD. Tuvalu has never had banknotes of its own, and has been issuing coins since 1976. However, the Tuvaluan dollar is used as a unit of account, and is pegged to the Australian dollar (the other currency of Tuvalu) at parity. From 1966 to 1976, Tuvalu officially used the Australian do

The Strategic Bitcoin Reserve is a proposed reserve asset, funded by the United States Department of the Treasury's forfeited bitcoin, announced by United States president Donald Trump in March 2025. The creation of the United States Digital Asset Stockpile for non-bitcoin assets was also announced. Trump has previously stated that he wants the United States to become the "crypto capita

UK Asset Resolution (UKAR) is a British financial services holding company with headquarters in the West Yorkshire village of Crossflatts (near Bradford & Bingley's former headquarters in Bingley). It was established in October 2010 as a bad bank to hold the two run-off elements, Bradford & Bingley (including the Mortgage Express brand) and NRAM plc (previously known as Northern Rock Ass

UK Financial Investments (UKFI) was a limited company set up in November 2008 and mandated by the UK government to manage HM Treasury's shareholdings in Lloyds Banking Group, the Royal Bank of Scotland Group and UK Asset Resolution. UKFI ceased trading in March 2018, and its business and assets were transferred to UK Government Investments.

Underwriting (UW) services are provided by some large financial institutions, such as banks, insurance companies and investment houses, whereby they guarantee payment in case of damage or financial loss and accept the financial risk for liability arising from such guarantee. An underwriting arrangement may be created in a number of situations including insurance, issues of security in a

Underwriting profit, also called underwriting income, is the profit an insurer makes from underwriting activities after claims and underwriting expenses are accounted for, excluding any investment income.

Unified Payments Interface (UPI) is an Indian instant payment system and protocol developed by the National Payments Corporation of India (NPCI) in April 11th 2016. The interface facilitates inter-bank peer-to-peer (P2P) and person-to-merchant (P2M) transactions. It is used on mobile devices to instantly transfer funds between two bank accounts using only a unique UPI ID. It runs as an o

In economics, unit of account, sometimes called currency unit or monetary unit, is a standard unit of measurement of the market value of goods, services, and other transactions. Also known as a measure of relative worth and a standard of deferred payment, a unit of account is a necessary prerequisite for the formulation of commercial agreements that involve debt.

In late 2021, the prices of many essential goods in the United Kingdom began increasing faster than household incomes, resulting in a fall in real incomes. The phenomenon has been termed a cost-of-living crisis. It is due in part to the economic impact of the COVID-19 pandemic, including a global surge in inflation, wage stagnation attributed to the Conservative Party's austerity program

The United Kingdom government austerity programme was a fiscal policy that was adopted for a period in the early 21st century following the era of the Great Recession. Coalition and Conservative governments in office from 2010 to 2019 used the term, and it was applied again by many observers to describe Conservative Party policies from 2021 to 2024, during the cost of living crisis. With

The Department of the Treasury (USDT) is the national treasury and finance department of the federal government of the United States. It is one of 15 current U.S. government departments. The treasury executes currency circulation in the domestic fiscal system, collects all federal taxes through the Internal Revenue Service, manages U.S. government debt, licenses and supervises banks and

The United States dollar (symbol: $; currency code: USD) is the official currency of the United States (U.S.) and several other countries. The U.S. Coinage Act of 1792 established the dollar as the base unit, with each dollar divided into 100 cents (symbol: ¢). U.S. banknotes are issued in the form of Federal Reserve Notes, popularly called greenbacks due to their predominantly green col

Securities regulation in the United States is the field of U.S. law that covers transactions and other dealings with securities. The term is usually understood to include both federal and state-level regulation by governmental regulatory agencies, but sometimes may also encompass listing requirements of exchanges like the New York Stock Exchange and rules of self-regulatory organizations

The United States Senate Committee on Banking, Housing, and Urban Affairs (formerly the Committee on Banking and Currency), also known as the Senate Banking Committee, has jurisdiction over matters related to banks and banking, price controls, deposit insurance, export promotion and controls, federal monetary policy, financial aid to commerce and industry, issuance of redemption of notes

In finance, unsecured debt refers to any type of debt or general obligation that is not protected by a guarantor, or collateralized by a lien on specific assets of the borrower in the case of a bankruptcy or liquidation or failure to meet the terms for repayment. Unsecured debts are sometimes called signature debt or personal loans. These differ from secured debt such as a mortgage, whic

The international currency code for the US dollar is USD. This article covers its definition, mechanisms, verification methods, and common misconceptions.

In finance, valuation is the process of determining the value of a (potential) investment, asset, or security.

In finance, a price (premium) is paid or received for purchasing or selling options.

The Vanna–Volga method is a mathematical tool used in finance. It is a technique for pricing first-generation exotic options in foreign exchange market (FX) derivatives.

A variance swap is an over-the-counter financial derivative that allows one to speculate on or hedge risks associated with the magnitude of movement, i.e. volatility, of some underlying product, like an exchange rate, interest rate, or stock index.

Venmo is an American mobile payment service founded in 2009 and owned by PayPal since 2013. Venmo is aimed at users who wish to split their bills or pay a business. Account holders can transfer funds to others via a mobile phone app. Account holders must be residents of the United States. Venmo also operates as a small social network, as users can observe other users' public transactions

Venture capital (VC) is a form of private equity financing provided by firms or funds to startup, early-stage, and emerging companies, that have been deemed to have high growth potential or that have demonstrated high growth in terms of number of employees, annual revenue, scale of operations, etc. Venture capital firms or funds invest in these early-stage companies in exchange for equit

Venture capital in Israel refers to the financial capital provided to early-stage, high-potential, high risk, growth startup companies based in Israel. The country's venture capital industry was born in the mid-1980s and has rapidly developed. Israel currently has more than 276 active venture capital funds, of which 71 are international VCs with Israeli offices. Israel's venture capital

Venture capital is a segment of the economy of Poland where private equity finances early-stage high-risk companies, with the potential for fast growth. As of March 2019, there is a total of 130 active VC firms in Poland, including local offices of international VC firms, and VC firms with mainly Polish management teams. Between 2009 and 2019, these entities have invested locally in over

In 2018, Iran recognized cryptocurrency mining as a legal industry in order to monitor and regulate the mining farms that were already operating. In December 2025 Iranian regime globally banned any and all transaction and transfer of cryptocurrency and along with that of in gold. In July 2018, President Hassan Rouhani's administration declared its intention of launching a national crypto

Virtual goods are non-physical objects and money purchased for use in online communities or online games. Digital goods, on the other hand, may be a broader category including digital books, music, and movies. Virtual goods are a subclass of intangible goods.

VIX is the ticker symbol and popular name for the Chicago Board Options Exchange's CBOE Volatility Index, a popular measure of the stock market's expectation of volatility based on S&P 500 index options. It is calculated and disseminated on a real-time basis by the CBOE, and is often referred to as the fear index or fear gauge.

Vix Technology (Vix) is an Australian company that designs, supplies and operates automated fare collection (AFC) systems, intelligent transportation systems (ITS), access, payment and passenger information display systems (PIDS) for the public transit industry.

In finance, volatility (usually denoted by "σ") is the degree of variation of a trading price series over time, usually measured by the standard deviation of logarithmic returns.

In finance, volatility arbitrage (vol arb) is a term for financial arbitrage techniques directly dependent and based on volatility.

In finance, a volatility swap is a forward contract on the future realised volatility of a given underlying asset. Volatility swaps allow investors to trade the volatility of an asset directly, much as they would trade a price index. Its payoff at expiration is equal to

The Volcker Rule is section 619 of the Dodd–Frank Wall Street Reform and Consumer Protection Act (12 U.S.C. § 1851). The rule was originally proposed by American economist and former United States Federal Reserve chair Paul Volcker in 2010 to restrict United States banks from making certain kinds of speculative investments that do not benefit their customers. It was not implemented until

The Vortex Indicator is a technical indicator invented by Etienne Botes and Douglas Siepman to identify the start of a new trend or the continuation of an existing trend within financial markets. It was published in the January 2010 edition of Technical Analysis of Stocks & Commodities.

Voting interest (or voting power) in business and accounting means the total number, or percent, of votes entitled to be cast on the issue at the time the determination of voting power is made, excluding a vote which is contingent upon the happening of a condition or event which has not occurred at the time.

The Warburg family is a prominent German and American banking family. They are noted for their varied accomplishments in biochemistry, botany, political activism, economics, investment banking, law, physics, classical music, art history, pharmacology, physiology, finance, private equity and philanthropy.

In finance, a warrant is a security that entitles the holder to buy or sell stock, typically the stock of the issuing company, at a fixed price called the strike price.

The Washington Stock Exchange was a regional stock exchange based in Washington, D.C. Active as early as the 1880s, on July 21, 1953, members of the Washington Stock Exchange board unanimously voted to merge with the Philadelphia-Baltimore Stock Exchange. The merge occurred in 1954, creating the Philadelphia-Baltimore-Washington Stock Exchange.

The inequality of wealth (i.e., inequality in the distribution of assets) has substantially increased in the United States since the late 1980s. Wealth commonly includes the values of any homes, automobiles, personal valuables, businesses, savings, and investments, less any associated debts.

Weather derivatives are financial instruments that can be used by organizations or individuals as part of a risk management strategy to reduce risk associated with adverse or unexpected weather conditions. Weather derivatives are index-based instruments that usually use observed weather data at a weather station to create an index on which a payout can be based. This index could be total

Web-to-print, also known as Web2Print, remote publishing or print e-commerce is commercial printing using web sites. Companies and software solutions that deal in web-to-print use standard e-commerce and online services like hosting, website design, and cross-media marketing.

WePay is an online payment service provider based in the United States. It provides an integrated and customizable payment solution, through its APIs, to platform businesses such as crowdfunding sites, marketplaces and small business software companies. It also offers partners fraud and risk protection.

WhopperCoin was a cryptocurrency launched by the Russian branch of Burger King as a loyalty program in the summer of 2017. It was primarily notable for being the first issuance of branded cryptocurrency by a major company and the first form of loyalty points that could be traded freely; the BBC noted that Burger King was the "first major corporate brand to issue its own crypto-cash", wit

In 1896, William McKinley was elected President of the United States. McKinley, a Republican and former Governor of Ohio, defeated the joint Democratic and Populist nominee, William Jennings Bryan, as well as minor-party candidates. McKinley's decisive victory in what is sometimes seen as a realigning election ended a period of close presidential contests, and ushered in an era of domina

Wise, formerly known as TransferWise, is a British financial technology company focused on global money transfers and Business Finance. Headquartered in London, it was founded by Kristo Käärmann and Taavet Hinrikus in January 2011. As of 2023, it offers three main products: Wise Account, Wise Business, and Wise Platform.

Wolfgang Stützel (23 January 1925, in Aalen, Germany – 1 March 1987, in Saarbrücken, West Germany) was a German economist and professor of economics at the Saarland University, Germany. From 1966 to 1968 he was member of the German Council of Economic Experts (German: Sachverständigenrat zur Begutachtung der gesamtwirtschaftlichen Entwicklung).

WooCommerce is an open-source e-commerce plugin for WordPress. It is designed for online merchants of all sizes using WordPress. Launched on September 27, 2011, the plugin gained popularity for its simplicity to install and customize and for the market position of the base product as freeware (even though many of its optional extensions are paid and proprietary). WooCommerce is developed