Regulation

Many jurisdictions, local as well as national, either ban gambling or heavily control it by licensing the vendors. Such regulation generally leads to gambling tourism and illegal gambling in the areas where it is not allowed. The involvement of governments, through regulation and taxation, has led to a close connection between many governments and gambling organizations, where legal gambling provides significant government revenue, such as in Monaco and Macau, China.

There is generally legislation requiring that gambling devices be statistically random, to prevent manufacturers from making some high-payoff results impossible. Since these high payoffs have very low probability, a house bias can quite easily be missed unless the devices are checked carefully.Most jurisdictions that allow gambling require participants to be above a certain age. In some jurisdictions, the gambling age differs depending on the type of gambling. For example, in many American states one must be over 21 to enter a casino, but may buy a lottery ticket after turning 18.

Insurance

Because contracts of insurance have many features in common with wagers, insurance contracts are often distinguished in law as agreements in which either party has an interest in the "bet-upon" outcome beyond the specific financial terms. e.g.: a "bet" with an insurer on whether one's house will burn down is not gambling, but rather insurance – as the homeowner has an obvious interest in the continued existence of their home independent of the purely financial aspects of the "bet" (i.e. the insurance policy). Nonetheless, both insurance and gambling contracts are typically considered aleatory contracts under most legal systems, though they are subject to different types of regulation.

Asset recovery

Under common law, particularly English Law (English unjust enrichment), a gambling contract may not give a casino bona fide purchaser status, permitting the recovery of stolen funds in some situations. In Lipkin Gorman v Karpnale Ltd, where a solicitor used stolen funds to gamble at a casino, the House of Lords overruled the High Court's previous verdict, adjudicating that the casino return the stolen funds less those subject to any change of position defence. U.S. Law precedents are somewhat similar. For case law on recovery of gambling losses where the loser had stolen the funds see "Rights of owner of stolen money as against one who won it in gambling transaction from thief".An interesting question is what happens when the person trying to make recovery is the gambler's spouse, and the money or property lost was either the spouse's, or was community property. This was a minor plot point in a Perry Mason novel, The Case of the Singing Skirt, and it cites an actual case Novo v. Hotel Del Rio.

Religious views

Buddhism

Lord Buddha stated gambling as a source of destruction in Singalovada Sutra.

Hinduism

Ancient Hindu poems like the Gambler's Lament and the Mahabharata testify to the existence of gambling among ancient Indians, while highlighting its destructive impact. The text Arthashastra (c. 4th century BCE) recommends taxation and control of gambling.

Judaism

Ancient Jewish authorities frowned on gambling, even disqualifying professional gamblers from testifying in court.

Christianity

Catholicism

The Catholic Church holds the position that there is no moral impediment to gambling, so long as it is fair, all bettors have a reasonable chance of winning, there is no fraud involved, and the parties involved do not have actual knowledge of the outcome of the bet (unless they have disclosed this knowledge), and as long as the following conditions are met: the gambler can afford to lose the bet, and stops when the limit is reached, and the motivation is entertainment and not personal gain leading to the "love of money" or making a living. In general, Catholic bishops have opposed casino gambling on the grounds that it too often tempts people into problem gambling or addiction, and has particularly negative effects on poor people; they sometimes also cite secondary effects such as increases in loan sharking, prostitution, corruption, and general public immorality. Some parish pastors have also opposed casinos for the additional reason that they would take customers away from church bingo and annual festivals where games such as blackjack, roulette, craps, and poker are used for fundraising. St. Thomas Aquinas wrote that gambling should be especially forbidden where the losing bettor is underage or otherwise not able to consent to the transaction. Gambling has often been seen as having social consequences, as satirized by Balzac. For these social and religious reasons, most legal jurisdictions limit gambling, as advocated by Pascal.

Protestantism

Gambling views among Protestants vary, with some either discouraging or forbidding their members from participation in gambling. Methodists, in accordance with the doctrine of outward holiness, oppose gambling which they believe is a sin that feeds on greed. Other denominations that discourage gambling are the United Methodist Church, the Free Methodist Church, the Evangelical Wesleyan Church, the Salvation Army, and the Church of the Nazarene.Other Protestants that oppose gambling include Mennonites, Schwarzenau Brethren, Quakers, the Christian Reformed Church in North America, the Church of the Lutheran Confession, the Southern Baptist Convention, the Assemblies of God, and the Seventh-day Adventist Church.

Other Christian denominations

Other churches that oppose gambling include the Jehovah's Witnesses, The Church of Jesus Christ of Latter-day Saints, the Iglesia ni Cristo, and the Members Church of God International.

Islam

There is a consensus among the ‘Ulema’ (Arabic: عُـلـمـاء, Scholars (of Islam)) that gambling is haraam (Arabic: حَـرام, sinful or forbidden). In assertions made during its prohibition, Muslim jurists describe gambling as being both un-Qur’anic, and as being generally harmful to the Muslim Ummah (Arabic: أُمَّـة, Community). The Arabic terminology for gambling is Maisir.

They ask you about intoxicants and gambling. Say: 'In them both lies grave sin, though some benefit, to mankind. But their sin is more grave than their benefit.'

In parts of the world that implement full Shari‘ah, such as Aceh, punishments for Muslim gamblers can range up to 12 lashes or a one-year prison term and a fine for those who provide a venue for such practises. Some Islamic nations prohibit gambling; most other countries regulate it.

Bahá'í Faith

According to the Most Holy Book, paragraph 155, gambling is forbidden.

Types

Casino games

While almost any game can be played for money, and any game typically played for money can also be played just for fun, some games are generally offered in a casino setting.

Table games

Electronic gambling

Online roulette

Pachinko

Sic Bo

Slot machine

Video poker

Video bingo

Other gambling

Bingo

Keno

Non-casino games

Gambling games that take place outside of casinos include bingo (as played in the US and UK), dead pool, lotteries, pull-tab games and scratchcards, and Mahjong.

Other non-casino gambling games include:

Non-casino card games, including historical games like Basset, Ecarté, Lansquenet and Put. Technically, a gambling card game is one in which the cards are not actually played but simply bet on.

Carnival Games such as The Razzle or Hanky Pank

Coin-tossing games such as Head and Tail, Two-up*

Confidence tricks such as Three-card Monte or the Shell game

Dice-based games, such as Backgammon, Liar's dice, Passe-dix, Hazard, Threes, Pig, or Mexico (or Perudo);*Although coin tossing is not usually played in a casino, it has been known to be an official gambling game in some Australian casinos

Fixed-odds betting

Fixed-odds betting and Parimutuel betting frequently occur at many types of sporting events, and political elections. In addition many bookmakers offer fixed odds on a number of non-sports related outcomes, for example the direction and extent of movement of various financial indices, the winner of television competitions such as Big Brother, and election results. Interactive prediction markets also offer trading on these outcomes, with "shares" of results trading on an open market.

Parimutuel betting

One of the most widespread forms of gambling involves betting on horse or greyhound racing. Wagering may take place through parimutuel pools, or bookmakers may take bets personally. Parimutuel wagers pay off at prices determined by support in the wagering pools, while bookmakers pay off either at the odds offered at the time of accepting the bet; or at the median odds offered by track bookmakers at the time the race started.

Sports betting

Betting on team sports has become an important service industry in many countries. Before the advent of the internet, millions of people played the football pools every week in the United Kingdom. In addition to organized sports betting, both legal and illegal, there are many side-betting games played by casual groups of spectators, such as NCAA basketball tournament Bracket Pools, Super Bowl Squares, Fantasy Sports Leagues with monetary entry fees and winnings, and in-person spectator games like Moundball.

Virtual sports

Based on Sports Betting, Virtual Sports are fantasy and never played sports events made by software that can be played every time without wondering about external things like weather conditions.

Arbitrage betting

Arbitrage betting is a theoretically risk-free betting system in which every outcome of an event is bet upon so that a known profit will be made by the bettor upon completion of the event regardless of the outcome. Arbitrage betting is a combination of the ancient art of arbitrage trading and gambling, which has been made possible by the large numbers of bookmakers in the marketplace, creating occasional opportunities for arbitrage.

Other types of betting

One can also bet with another person that a statement is true or false, or that a specified event will happen (a "back bet") or will not happen (a "lay bet") within a specified time. This occurs in particular when two people have opposing but strongly held views on truth or events. Not only do the parties hope to gain from the bet, they place the bet also to demonstrate their certainty about the issue. Some means of determining the issue at stake must exist. Sometimes the amount bet remains nominal, demonstrating the outcome as one of principle rather than of financial importance.

Betting exchanges allow consumers to both back and lay at odds of their choice. Similar in some ways to a stock exchange, a bettor may want to back a horse (hoping it will win) or lay a horse (hoping it will lose, effectively acting as bookmaker).

Spread betting allows gamblers to wagering on the outcome of an event where the pay-off is based on the accuracy of the wager, rather than a simple "win or lose" outcome. For example, a wager can be based on the when a point is scored in the game in minutes and each minute away from the prediction increases or reduces the payout.

Staking systems

Many betting systems have been created in an attempt to "beat the house" but no system can make a mathematically unprofitable bet in terms of expected value profitable over time. Widely used systems include:

Card counting – Many systems exist for blackjack to keep track of the ratio of ten values to all others; when this ratio is high the player has an advantage and should increase the amount of their bets. Keeping track of cards dealt confers an advantage in other games as well.

Due-column betting – A variation on fixed profits betting in which the bettor sets a target profit and then calculates a bet size that will make this profit, adding any losses to the target.

Fixed profits – the stakes vary based on the odds to ensure the same profit from each winning selection.

Fixed stakes – a traditional system of staking the same amount on each selection.

Kelly – the optimum level to bet to maximize your future median bank level.

Martingale – A system based on staking enough each time to recover losses from previous bet(s) until one wins.

Other uses of the term

Many risk-return choices are sometimes referred to colloquially as "gambling." Whether this terminology is acceptable is a matter of debate:

Emotional or physical risk-taking, where the risk-return ratio is not quantifiable (e.g., skydiving, campaigning for political office, asking someone for a date, etc.)

Insurance is a method of shifting risk from one party to another. Insurers use actuarial methods to calculate appropriate premiums, which is similar to calculating gambling odds. Insurers set their premiums to obtain a long term positive expected return in the same manner that professional gamblers select which bets to make. While insurance is sometimes distinguished from gambling by the requirement of an insurable interest, the equivalent in gambling is simply betting against one's own best interests (e.g., a sports coach betting against his own team to mitigate the financial repercussions of a losing season).

Situations where the possible return is of secondary importance to the wager/purchase (e.g. entering a raffle in support of a charitable cause)Investments are also usually not considered gambling, although some investments can involve significant risk. Examples of investments include stocks, bonds and real estate. Starting a business can also be considered a form of investment. Investments are generally not considered gambling when they meet the following criteria:

Economic utility

Positive expected returns (at least in the long term)

Underlying value independent of the risk being undertakenSome speculative investment activities are particularly risky, but are sometimes perceived to be different from gambling:

Foreign currency exchange (forex) transactions

Prediction markets

Securities derivatives, such as options or futures, where the value of the derivative is dependent on the value of the underlying asset at a specific point in time (typically the derivative's associated expiration date)

Negative consequences

Studies show that though many people participate in gambling as a form of recreation or to earn an income, gambling, like any behavior involving variation in brain chemistry, can become a behavioral addiction. Behavioral addiction can occur with all the negative consequences in a person's life minus the physical issues faced by people who compulsively engage in drug and alcohol abuse.Problem gambling has multiple symptoms. Gamblers often gamble to try to win back money they have lost, and some gamble to relieve feelings of helplessness and anxiety.In the United Kingdom, the Advertising Standards Authority has censured several betting firms for advertisements disguised as news articles suggesting falsely that a person had cleared debts and paid for medical expenses by gambling online . The firms face possible fines.A 2020 study of 32 countries found that the greater the amount of gambling activity in a given country, the more volatile that country's stock market prices are.

Psychological biases

Gamblers may exhibit a number of cognitive and motivational biases that distort the perceived odds of events and that influence their preferences for gambles.

Preference for likely outcomes. When gambles are selected through a choice process – when people indicate which gamble they prefer from a set of gambles (e.g., win/lose, over/under) – people tend to prefer to bet on the outcome that is more likely to occur. Bettors tend to prefer to bet on favorites in athletic competitions, and sometimes will accept even bets on favorites when offered more favorable bets on the less likely outcome (e.g., an underdog team).

Optimism/Desirability Bias. Gamblers also exhibit optimism, overestimating the likelihood that desired events will occur. Fans of NFL underdog teams, for example, will prefer to bet on their teams at even odds than to bet on the favorite, whether the bet is $5 or $50.

Reluctance to bet against (hedge) desired outcomes. People are reluctant to bet against desired outcomes that are relevant to their identity. Gamblers exhibit reluctance to bet against the success of their preferred U.S. presidential candidates and Major League Baseball, National Football League, National Collegiate Athletic Association (NCAA) basketball, and NCAA hockey teams. More than 45% of NCAA fans in Studies 5 and 6, for instance, turned down a "free" real $5 bet against their team. From a psychological perspective, such a "hedge" creates an interdependence dilemma – a motivational conflict between a short-term monetary gain and the long-term benefits accrued from feelings of identification with and loyalty to a position, person, or group whom the bettor desires to succeed. In economic terms, this conflicted decision can be modeled as a trade-off between the outcome utility gained by hedging (e.g., money) and the diagnostic costs it incurs (e.g., disloyalty). People make inferences about their beliefs and identity from their behavior. If a person is uncertain about an aspect of their identity, such as the extent to which they values a candidate or team, hedging may signal to them that they are not as committed to that candidate or team as they originally believed. If the diagnostic cost of this self-signal and the resulting identity change are substantial, it may outweigh the outcome utility of hedging, and they may reject even very generous hedges.

Ratio bias. Gamblers will prefer gambles with worse odds that are drawn from a large sample (e.g., drawing one red ball from an urn containing 89 red balls and 11 blue balls) to better odds that are drawn from a small sample (drawing one red ball from an urn containing 9 red balls and one blue ball).

Gambler's fallacy/positive recency bias.