Industry WIKI

PFTS index is a benchmark index of PFTS Ukraine Stock Exchange, Ukraine's leading bourse. Beside PFTS Index, there are also the UX Index of the Ukrainian Exchange and the Ukrainian Average Index 50 (UAI-50) being composed by analysts of internet-publisher fundmarket.ua.

PharmEasy is an Indian e-pharmacy company that sells medicines, diagnostics and telehealth online.

The Philippine Dealing & Exchange Corp. (PDEx) is a dealing exchange for major banks in the Philippines. The primary exchange of the country for all sectors is the Philippine Stock Exchange.

Phillip David Cagan (April 30, 1927 – June 15, 2012) was an American scholar and author. He was Professor of Economics Emeritus at Columbia University.

PhonePe is an Indian digital payments and financial services company, headquartered in Bengaluru. It was founded in December 2015, by Sameer Nigam, Rahul Chari and Burzin Engineer. The PhonePe app, based on the Unified Payments Interface, went live in August 2016.

Pierre de Murat de Cros, O.S.B., (c. 1320 – 1388) was a French monk of aristocratic origins who became a cardinal of the Avignon Obedience during the Great Schism, as well as the Archbishop of Arles and the Chamberlain of the Apostolic Camera (Latin: Camerarius Apostolicus). Refusing from the day of his election to support Bartolomeo Prignano (Pope Urban VI, the former head of the rival

Pierre Morad Omidyar (born Parviz Morad Omidyar, June 21, 1967) is a French-born Iranian-American billionaire. A technology entrepreneur, software engineer, and philanthropist, he is the founder of eBay, where he served as chairman from 1998 to 2015. Omidyar is the grandson of the Imperial Iranian Army General Mahmud Mir-Djalali, who was instrumental in the 1921 rise of the Pahlavi Dyna

A pig-butchering scam or romance baiting scam is a form of online relationship and investment fraud in which perpetrators cultivate fake romantic or social relationships with victims before persuading them to invest money, often in fraudulent cryptocurrency schemes. Such scams are common on social media and dating apps, and often involve catfishing, investment fraud, and romance scams.

Pine Labs is an Indian multinational Financial Technology company headquartered in Noida, Uttar Pradesh, that provides point of sale (POS) systems and payment systems. Founded in 1998, it facilitates digital payments through Android-based POS machines that are primarily used by retailers in India, UAE, and Malaysia.

A pitch book, also called a confidential information memorandum, is a marketing presentation (information layout) used by investment banks, entrepreneurs, corporate finance firms, business brokers and other M&A intermediaries advising on the sale or disposal of the shares or assets of a business. It consists of a careful arrangement and analysis of the investment considerations of the cl

Pix (Portuguese pronunciation: [ˈpiks]) is an instant payment platform created and managed by the Central Bank of Brazil (BCB). It enables free instant transfers between individuals in Brazilian real 24 hours a day without interruption, even outside banking hours and during holidays or weekends; payments made and received by legal entities may be subject to fees.

Plaid Inc. is an American financial services company based in San Francisco, California. The company builds a data transfer network that powers fintech and digital finance products.

Plastic cards usually serve as identity documents, thus providing authentication. In combination with other assets that complement the data stored on the card, like PINs, they also serve authorization purposes, most often as debit or credit cards for allowing their holders to make financial transactions. Early and simpler cards feature only hard-to-imitate integrated photographs, securit

The point of sale (POS), or point of purchase (POP), is the time and place at which a retail transaction is completed. At the point of sale, the merchant calculates the amount owed by the customer, indicates that amount, may prepare an invoice for the customer (which may be a cash register printout), and indicates the options for the customer to make payment. It is also the point at wh

Point-of-sale malware (POS malware) is usually a type of malicious software (malware) that is used by cybercriminals to target point of sale (POS) and payment terminals with the intent to obtain credit card and debit card information, a card's track 1 or track 2 data and even the CVV code, by various man-in-the-middle attacks, that is the interception of the processing at the retail chec

The Polak model is a monetary approach to the balance of payment published by J. J. Polak in 1957. It seeks to model a small, open economy operating under fixed nominal exchange rate. Polak suggest explicit links between the monetary and external sectors. Polak results continue to form the theoretical bases on which the IMF Financial Programming are carried out.

POLi Payments Pty Ltd (formerly known as Centricom) is an online payments company based in Melbourne, Australia. It is the developer and provider of POLi, an online payment system that is used by merchants and customers in Australia and New Zealand. POLi Payments was acquired by SecurePay Holdings, a fully owned subsidiary of Australia Post, in December 2014.

Policy bank (Chinese: 政策性银行), or policy lender, is a state-owned financial institution established by the government of the People's Republic of China with the goal of implementing official economic policies and carrying out financial business in specific fields. This measure separates policy finance from commercial finance and establishes a policy bank to undertake strictly defined poli

Polkadot is a decentralized, nominated proof-of-stake blockchain with smart contract functionality. The cryptocurrency native to the blockchain is the DOT.

Polygon (formerly Matic Network) is a blockchain platform which aims to create a multi-chain blockchain system compatible with Ethereum. As with Ethereum, it uses a proof-of-stake consensus mechanism for processing transactions on-chain. Polygon's native token is POL, an ERC-20 token which allows for compatibility with other Ethereum cryptocurrencies. It is operated by Polygon Labs.

The Pooled Income Fund (PIF) is a type of charitable mutual fund or charitable trust that pools the securities or cash separately donated by an individual, a family or a corporation to a charity, which is then invested to provide dividends for both the donor's beneficiary and charity. The donations are irrevocable and tax-deductible and must be from personal assets. Capital gains taxes d

Popcat is an Internet meme originating in October 2020, in a series of videos which showcase two images of a domestic short-haired cat named 'Oatmeal', where one image has its mouth closed and the other has its mouth open, with the second image being edited to give its mouth an 'O' shape. The meme was later created into a popular game. It has since also been made into a widely available

Port City Colombo (Sinhala: කොළඹ වරාය නගරය, romanised: Koḷam̆ba Warāya Nagaraya) is a multi-services special economic zone located in Colombo, Sri Lanka, which is currently under construction on reclaimed land adjacent to the Galle Face Green. The land reclamation work had been completed as of January 2019. In 2017, the cost was stated to be US$ 15 billion. Port City Colombo is a multi-b

A portfolio manager (PM) is a professional responsible for making investment decisions and carrying out investment activities on behalf of vested individuals or institutions. Clients invest their money for future growth, such as a retirement fund, endowment fund, or education fund. PMs work with a team of analysts and researchers and are responsible for establishing an investment strateg

Portfolio optimization is the process of selecting an optimal portfolio (asset distribution), out of a set of considered portfolios, according to some objective. The objective typically maximizes factors such as expected return, and minimizes costs like financial risk, resulting in a multi-objective optimization problem. Factors being considered may range from tangible (such as assets, l

Simply stated, post-modern portfolio theory (PMPT) is an extension of the traditional modern portfolio theory (MPT) of Markowitz and Sharpe. Both theories provide analytical methods for rational investors to use diversification to optimize their investment portfolios. The essential difference between PMPT and MPT is that PMPT emphasizes the return that must be earned on an investment in

Post-money valuation is a way of expressing the value of a company after an investment has been made. This value is equal to the sum of the pre-money valuation and the amount of new equity.

Postepay is an Italian company that offers a prepaid card service, launched at the end of 2003 and still marketed by Poste Italiane, which can be used anywhere in Italy (ATM and POS of the Postamat and Visa Electron circuits) and abroad (ATM and POS of the Visa/Visa Electron circuit), on the Internet (in sites that accept Visa and Visa Electron cards) and in all Italian post offices thro

Powa Technologies was a UK-based technology company, known for its commerce, mobile commerce and e-commerce services.

A dual-currency note (DC) pays coupons in the investor's domestic currency with the notional in the issuer's domestic currency. A reverse dual-currency note (RDC) is a note which pays a foreign interest rate in the investor's domestic currency. A power reverse dual-currency note (PRDC) is a structured product where an investor is seeking a better return and a borrower a lower rate by tak

PRA Group, Inc. is a publicly traded debt buyer and debt collection company based in Norfolk, Virginia. The company buys delinquent consumer debt from credit card issuers and other financial institutions at a discount and pursues collection of the full debt owed. Founded in 1996, PRA Group employs more than 3200 people in 18 countries.

"Pre-money valuation" is a term widely used in the private equity and venture capital industries. It refers to the valuation of a company or asset prior to an investment or financing. If an investment adds cash to a company, the company will have a valuation after the investment that is equal to the pre-money valuation plus the cash amount. That is, the pre-money valuation refers to the

Predictive analytics encompasses a variety of statistical techniques from data mining, predictive modeling, and machine learning that analyze current and historical facts to make predictions about future or otherwise unknown events.

In finance and mathematics, predictive modelling is the use of statistics to predict outcomes. Most often the event one wants to predict is in the future, but predictive modelling can be applied to any type of unknown event, regardless of when it occurred. For example, predictive models are often used to detect crimes and identify suspects, after the crime has taken place.

The Prefecture for the Economic Affairs of the Holy See was a dicastery of the Roman Curia, erected on 15 August 1967, and entrusted with overseeing all the offices of the Holy See that managed finances, regardless of their degree of autonomy.

Preferred stock (also called preferred shares, preference shares, or simply preferreds) is a component of share capital that may have any combination of features not possessed by common stock, including properties of both an equity and a debt instrument, and is generally considered a hybrid instrument. Preferred stocks are senior (i.e., higher ranking) to common stock but subordinate to

Prepaid refers to goods and services paid for in advance. Examples include postage stamps, attorneys, tolls, public transit cards like the Greater London Oyster card, pay as you go cell phones, and stored-value cards such as gift cards and preloaded credit cards.

In economics and finance, the price discovery process (also called price discovery mechanism) is the process of determining the price of an asset in the marketplace through the interactions of buyers and sellers.

Price stability occurs when average consumer prices for goods and services are constant over time, or when they are rising at a low and predictable rate. It is a goal of monetary and fiscal policy aiming to support sustainable rates of economic activity. Policy is set to maintain a very low rate of inflation or deflation. For example, the European Central Bank (ECB) describes price s

In economics, a price system is a system through which the valuations of any forms of property (tangible or intangible) are determined. All societies use price systems in the allocation and exchange of resources as a consequence of scarcity. Even in a barter system with no money, price systems are still utilized in the determination of exchange ratios (relative valuations) between the pr

This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison.

The prime rate or prime lending rate is an interest rate used by banks, typically representing the rate at which they lend to their most creditworthy customers. Some variable interest rates may be expressed as a percentage above or below prime rate.

Principles for Responsible Investment (UNPRI or PRI) is a United Nations-supported international network of financial institutions working together to implement its six aspirational principles, often referenced as "the Principles". Its goal is to understand the implications of sustainability for investors and support signatories to facilitate incorporating these issues into their investm

Private banking is a general description for banking, investment and other financial services provided by banks and financial institutions primarily serving high-net-worth individuals (HNWIs) – those with very high income or substantial assets. Private banking is presented by those who provide such services as an exclusive subset of wealth management services, provided to particularly af

Private credit is an aspect of the shadow banking system involving assets defined by non-bank lending where the debt is not issued or traded on the public markets. "Private credit" can also be referred to as "direct lending" or "private lending". It is a subset of "alternative credit". Estimations of the global private credit industry's size vary; as of April 2024, the International Mone

A private equity fund (PE fund) is a collective investment scheme used for making investments in various equity (and to a lesser extent debt) securities according to one of the investment strategies associated with private equity. Private equity funds are typically limited partnerships with a fixed term of 10 years (often with one- or two-year extensions). At inception, institutional inv

Private equity in the 1980s relates to one of the major periods in the history of private equity and venture capital. Within the broader private equity industry, two distinct sub-industries, leveraged buyouts and venture capital experienced growth along parallel although interrelated tracks.

Private equity in the 1990s relates to one of the major periods in the history of private equity and venture capital. Within the broader private equity industry, two distinct sub-industries, leveraged buyouts and venture capital, experienced growth along parallel although interrelated tracks.

Private equity in the 2000s represents one of the major growth periods in the history of private equity and venture capital. Within the broader private equity industry, two distinct sub-industries, leveraged buyouts and venture capital, expanded along parallel and interrelated tracks.

Private equity (PE) expanded throughout the 2010s. As of 2019, there were nearly 7,000 PE firms within the United States, nearly $2.5 trillion globally in unspent cash (known as dry powder), and deal-making in private equity accounted for 13% of global acquisitions.

In the 2020s private equity (PE) firms responded to the COVID-19 recession with a surge in funding.

Private equity real estate is a term used in investment finance to refer to a specific subset of the real estate investment asset class. Private equity real estate refers to one of the four quadrants of the real estate capital markets, which include private equity, private debt, public equity and public debt.

The private finance initiative (PFI) was a United Kingdom government procurement policy aimed at creating "public–private partnerships" (PPPs) where private firms are contracted to complete and manage public projects. Initially launched in 1992 by Prime Minister John Major, and expanded considerably by the Blair government, PFI is part of the wider programme of privatisation and macroeco

A private investment in public equity, commonly known as a PIPE deal, involves selling of publicly traded common shares or some form of preferred stock or convertible security to private investors. It is an allocation of shares in a public company not through a public offering in a stock exchange. PIPE deals are part of the primary market. In the U.S., a PIPE offering may be registered w

Private placement or non-public offering is a funding round of securities which are sold not through a public offering, but rather through a private offering, mostly to a small number of chosen investors. Generally, these investors include friends and family, accredited investors, and institutional investors. Placement agents help find investors.

A private placement agent or placement agent is a firm assisting fund managers in the alternative asset class (e.g., private equity, infrastructure, real estate, hedge funds, and venture capital) and entrepreneurs/private companies (e.g., start-ups and growth capital companies) seeking to raise private financing through a so-called private placement.

In the context of sovereign debt crisis, private sector involvement (PSI) is, broadly speaking, the forced contribution of private sector creditors to a financial crisis resolution process, and, specifically, to the private sector incurring outright reductions ("haircuts") on the value of its debt holdings.

In finance, the Private Equity Secondary Market (also often called Private Equity Secondaries or Secondaries) refers to the buying and selling of pre-existing investor commitments to private equity and other alternative investment funds or the underlying private equity assets (e.g., credit secondaries). Unlike public markets, private-equity interests lack an established trading exchange,

A prize-linked savings account (PLSA) or lottery-linked deposit account is a savings account in which some of the interest payment on bank deposits or marketing dollars are distributed as prizes based on chance. They are attractive to consumers as they function both as a sweepstakes or game of chance (as there is a small chance of a large prize) and as savings vehicle (the deposit is nev

Profit margin is a financial ratio that measures the percentage of profit earned by a company in relation to its revenue. Expressed as a percentage, it indicates how much profit the company makes for every dollar of revenue generated. Profit margin is important because this percentage provides a comprehensive picture of the operating efficiency of a business or an industry. All margin ch

ProMéxico is a trust fund of the Federal government of Mexico —a subdivision of the Secretariat of Economy— that promoted international trade and investment. ProMéxico used to be in charge of the country's active participation in the international arena by firmly establishing Mexico as an attractive, safe and competitive destination for foreign investment; encouraging the exportation of

A promissory note, sometimes referred to as a note payable, is a financial instrument in which one party (the maker or issuer) promises in writing to pay a determinate sum of money to another (the payee), subject to any terms and conditions specified within the document.

Proof of space (PoS) is a type of consensus algorithm achieved by demonstrating one's legitimate interest in a service (such as sending an email) by allocating a non-trivial amount of memory or disk space to solve a challenge presented by the service provider. The concept was formulated in 2013 by Dziembowski et al. and (with a different formulation) by Ateniese et al..

Proof-of-stake (PoS) protocols are a class of consensus mechanisms for blockchains that work by selecting validators in proportion to their quantity of holdings in the associated cryptocurrency. This is done to avoid the computational cost of proof-of-work (PoW) schemes. The first functioning use of PoS for cryptocurrency was Peercoin in 2012, although its scheme, on the surface, still r

Proof of work (also written as proof-of-work, and abbreviated PoW) is a form of cryptographic proof in which one party (the prover) proves to others (the verifiers) that a certain amount of a specific computational effort has been expended. Verifiers can subsequently confirm this expenditure with minimal effort on their part. The concept was first proposed by Moni Naor and Cynthia Dwork

Property investment calculator is a term used to define an application that provides fundamental financial analysis underpinning the purchase, ownership, management, rental and/or sale of real estate for profit. Property investment calculators are typically driven by mathematical finance models and converted into source code. Key concepts that drive property investment calculators inclu

The Dodd–Frank Wall Street Reform and Consumer Protection Act was created as a response to the financial crisis in 2007. Passed in 2010, the act contains a great number of provisions, taking over 848 pages. It targets the sectors of the financial system that were believed to be responsible for the financial crisis, including banks, mortgage lenders, and credit rating agencies. Ostensibly

The Prudential Regulation Authority (PRA) is a United Kingdom financial services regulatory body, formed as one of the successors to the Financial Services Authority (FSA). The authority is responsible for the prudential regulation and supervision of banks, building societies, credit unions, insurers and major investment firms. It sets standards and supervises financial institutions at t

A public bank is a bank, a financial institution, in which a state, municipality, or public actors are the owners. It is an enterprise under government control. Prominent among current public banking models are the Bank of North Dakota, the Sparkassen-Finanzgruppe in Germany, and many nations' postal bank systems.

Public budgeting is a field of public administration and a discipline in the academic study of public administration. Budgeting is characterized by its approaches, functions, formation, and type.

Public finance refers to the monetary resources available to governments and also to the study of finance within government and role of the government in the economy. Within academic settings, public finance is a widely studied subject in many branches of political science, political economy and public economics. Research assesses the government revenue and government expenditure of the

The pattern of public expenditure and revenue in Costa Rica is typical of a middle income country. According to the CIA World Factbook, in 2023, central government revenue was US $26.333 billion, while expenditure was $25.953 billion.

The public market equivalent (PME) is a collection of performance measures developed to assess private equity funds and to overcome the limitations of the internal rate of return and multiple on invested capital measurements. While the calculations differ, they all attempt to measure the return from deploying a private equity fund's cash flows into a stock market index.

A public–private partnership (PPP, 3P, or P3) is a long-term arrangement between a government and private sector institutions. Typically, it involves private capital financing government projects and services up-front, and then drawing revenues from taxpayers and/or users for profit over the course of the PPP contract. Public–private partnerships have been implemented in multiple countri

Publicly traded private equity, also known as publicly quoted private equity or publicly listed private equity, is an investment firm or investment vehicle, which makes investments conforming to one of the various private equity strategies, and is listed on a public stock exchange.

Publix Super Markets, Inc., doing business as Publix, is an employee-owned American supermarket chain headquartered in Lakeland, Florida. Founded in 1930 by George W. Jenkins, Publix is a private corporation that is wholly owned by present and past employees and members of the Jenkins family. Publix operates throughout the Southeastern United States, with locations in Florida (897), Geor

Pump and dump (P&D) is a form of securities fraud that involves artificially inflating the price of an owned stock through false and misleading positive statements (pump), in order to sell the cheaply purchased stock at a higher price (dump).

pump.fun (commonly referred to as Pump) is a cryptocurrency launchpad for the Solana blockchain that enables users to create tokens and trade them immediately on the platform, as well as to launch them onto decentralized exchanges, a process known as "graduation". The platform was launched on January 19, 2024, by Noah Tweedale, Alon Cohen and Dylan Kerler.

Purchasing power parity (PPP) is a measure of the price of specific goods in different countries and is used to compare the absolute purchasing power of the countries' currencies. PPP is effectively the ratio of the price of a market basket at one location divided by the price of the basket of goods at a different location. The PPP inflation and exchange rate may differ from the market e

In financial mathematics, the put–call parity defines a relationship between the price of a European call option and European put option, both with the identical strike price and expiry, namely that a portfolio of a long call option and a short put option is equivalent to (and hence has the same value as) a single forward contract at this strike price and expiry. This is because if the p

Q-commerce, also referred to as quick commerce, is a type of e-commerce where emphasis is on quick deliveries, typically in less than an hour. Q-commerce originally started with food delivery and it still represents the largest chunk of the business. It has quickly expanded to other categories particularly for grocery delivery, medicines, gifts, and apparel.

QIWI plc was a Russian company that provides payment and financial services in Russia and CIS countries. The group includes QIWI payment system, QIWI Bank, CONTACT money transfer system, Factoring PLUS, Flocktory, and RealWeb. The company has representative offices in three countries.

A QR code payment is a mobile payment method where payment is performed by scanning a QR code from a mobile app. This is an alternative to doing electronic funds transfer at point of sale using a payment terminal. This avoids a lot of the infrastructure traditionally associated with electronic payments such as payment cards, payment networks, payment terminal and merchant accounts.

Quick Response Code Indonesia Standard (abbreviated as QRIS, the abbreviation being a wordplay on keris, a traditional sword; Indonesian: Kode QR Standar Indonesia) is a QR code payment system developed by Bank Indonesia (BI) and the Indonesian Payment System Association (ASPI) aimed to integrate all non-cash payment methods in Indonesia. Launched in 2019, the system enables peer-to-peer

Quadriga Fintech Solutions was the owner and operator of QuadrigaCX. QuadrigaCX was believed to be Canada's largest cryptocurrency exchange at the time of its collapse in 2019, with the exchange ceasing operations and the company filing for bankruptcy with C$215.7 million in liabilities and about C$28 million in assets.

Quahl ( k-oo-ah-l), formerly known as Initiative Q, was an attempt to create a new payment network and digital currency. It was created by Israeli entrepreneur Saar Wilf, who previously founded Fraud Sciences, a payment security company acquired by PayPal. Quahl is backed by Cato Institute economist Lawrence H. White. The initiative has indicated it will not take measures to evade state

Qualified residence interest is the most significant exception to the limitations imposed by § 163(h) of the Internal Revenue Code.

Quantitative analysis in finance refers to the application of mathematical and statistical methods to problems in financial markets and investment management. Professionals in this field are known as quantitative analysts or quants.

Quantitative easing (QE) is a monetary policy action where a central bank purchases predetermined amounts of government bonds, company shares, or other financial assets (liquidity) in order to artificially stimulate economic activity. Quantitative easing is a novel form of monetary policy that began in Japan and came into wide application in the US following the 2008 financial crisis. It

Quantitative tightening (QT) is a contractionary monetary policy tool applied by central banks to decrease the amount of liquidity or money supply in the economy. A central bank implements quantitative tightening by reducing the financial assets it holds on its balance sheet by selling them into the financial markets, which decreases asset prices and raises interest rates. QT is the re

QuantLib is an open-source software library which provides tools for software developers and practitioners interested in financial instrument valuation and related subjects. QuantLib is written in C++.

In finance, quote stuffing refers to a form of market manipulation employed by high-frequency traders (HFT) that involves quickly entering and withdrawing a large number of orders in an attempt to flood the market. This can create confusion in the market and trading opportunities for high-speed algorithmic traders. The term is relatively new to the financial market lexicon and was coined

The Rail Travel Card was a credit card administered by the Rail Travel Credit Agency headquartered at Chicago Union Station (room 436) to facilitate leisure and business travel by rail, possibly modeled on the air travel card. It was accepted by most major railroads, the prominent exceptions being New Haven and Southern Pacific.

Rain is a Middle Eastern cryptocurrency exchange company that operates through its holding company, Rain Financial Inc., which oversees Rain Management W.L.L. in Bahrain,

The Rapid Pass is a smart card automated fare collection system based on near-field communication (NFC) technology used on participating public transit systems in Dhaka, the capital of Bangladesh. Rapid Pass card readers were implemented on a trial basis in 2017. Full implementation began in January 2018 and it was rolled out across rapid transit stations, railway stations, bus stops and

In financial economics, rational pricing is the assumption that asset pricing models must reflect the arbitrage-free price of the asset

Rav-Kav (Hebrew: רב-קו, lit. "multi-line") is a reusable contactless stored value smart card for making electronic payments as a joint fare collection system for the different public transportation operators across Israel.

Re Bank of Credit and Commerce International SA (No 8) [1998] AC 214 is a UK insolvency law case, concerning the taking of a security interest over a company's assets and priority of creditors in a company winding up.

The real bills doctrine says that as long as bankers lend to businessmen only against the security (collateral) of short-term 30-, 60-, or 90-day commercial paper representing claims to real goods in the process of production, the loans will be just sufficient to finance the production of goods. The doctrine seeks to have real output determine its own means of purchase without affecting

A real estate mortgage investment conduit (REMIC) is a business entity that issues investment securities representing interests in a portfolio of mortgages. Under U.S. Federal income tax law a REMIC can qualify for treatment as a partnership, with tax payable by investors rather than the entity. REMICs are used for the pooling of mortgage loans and issuance of mortgage-backed securities