Betting arbitrage, miracle bets, sure bets, sports arbitraging is a particular case of arbitrage arising on betting markets due to bookmakers’ different opinions on either event outcomes or plain errors. By placing one bet per each outcome with different betting companies, the bettor can make a profit. In the bettors' slang an arbitrage is often referred to as an arb; people who use arbitrage are called arbers. A typical arb is around 2 percent, often less; however 4-5 percent are occasionally seen and during some special events they might reach 20 percent. Arbitrage betting involves relatively large sums of money stakes are bigger than in normal betting.

Bookmakers generally disapprove of arbers, and restrict or close the accounts of those who they suspect of engaging in arbitrage betting. Although arbitrage betting has existed since the beginnings of bookmaking, the rise of the Internet, odds-comparison websites and betting exchanges have enabled the practice to be easier to perform. On the other hand, these changes also made it easier for bookmakers to keep their odds in line with the market.

The best way of generating profit, which has been established in Britain via sports arbitrage, consists of 'key men' employing others to place bets on their behalf, so as to avoid detection and increase accessibility to bookmakers. This allows the financiers or key arbers to stay at a computer to keep track of market movement.

While often claimed to be risk-free, this is only true if an arb is successfully completed; in reality, there are several threats to this:

Arbs in online sports markets have a median lifetime of around 15 minutes, after which the difference in odds underpinning them vanishes through betting activity. Without rapid alerting and action, it is possible to fail to make all the legs of the arb before it vanish, thus transforming it from a risk-free arb into a bet. High street bookmakers however, offer their odds days in advance and rarely change them once they have been set. These Arbs can have a lifetime of several hours.

Making errors: In the excitement of the action and due to the high number of bets placed, it is not uncommon to make a mistake like traders on financial markets. For example the appropriate stakes may be incorrectly calculated, or be placed on the wrong legs of the arb, locking in a loss, or there may be inadequate funds in one of the accounts to complete the arb. Those errors might temporarily have an important impact. In the long term, the benefit will depend on the odds. For example one could actually make more money by placing the wrong bet where the outcome happens to be beneficial, though not justified by the arbitrage calculation. However, this stroke of luck being repeated is unlikely, assuming the bookies have calculated the odds so they make a profit.

Bet cancellation: If a bettor places bets so as to make an arbitrage and one bookmaker cancels a bet, the bettor could find himself in a bad position because he is actually betting with all the risks implied. The bettor can repeat the bet that has been cancelled so as minimize the risk, but if he cannot get the same odds he had before he may be forced to take a loss. In some cases the situation arises when there are very high potential payouts by the bookie, perhaps due to an unintentional error made while quoting odds. Many jurisdictions allow bookmakers to cancel bets in the event of such a palpable [obvious] error in the quoted odds This is often loosely defined as an obvious mistake, but whether a palp in fact has been made is often the sole discretion of the bookmaker.

Other problems: Bookmakers who suspect arbing can set very low maximum stake limits, making arbing insufficiently profitable. Capital diffusion is serious; many bookmakers make it very easy to deposit funds and difficult to withdraw them. Making a return involves many bets spread over typically many bookmakers so keeping track is a considerable challenge, and requires excellent record-keeping.

Paradise Nevada

Paradise is an unincorporated town in the Las Vegas metropolitan area in Clark County, Nevada, United States. The population was 223,167 at the 2010 census. As an unincorporated town, it is governed by the Clark County Commission with input from the Paradise Town Advisory Board.

Paradise contains McCarran International Airport, University of Nevada, Las Vegas, and most of the Las Vegas Strip, including well-known hotels such as Caesars Palace, the Palms, and the MGM Grand. Therefore, many tourists visiting the Las Vegas area actually spend most of their time in Paradise, rather than in the City of Las Vegas. Despite this, Paradise remains relatively unknown, since “Paradise, NV” does not appear in postal addresses. The United States Postal Service has assigned “Las Vegas, NV” as the place name for the ZIP codes containing Paradise. Nonetheless, if Paradise were to be incorporated, it would be one of the largest cities in Nevada.

Las Vegas Valley

The Las Vegas Valley is the heart of the Las Vegas-Paradise, NV MSA also known as the Las Vegas–Paradise–Henderson MSA which includes all of Clark County, Nevada, and is a metropolitan area in the southern part of the U.S. state of Nevada. The Valley is defined by the Las Vegas Valley landform, a 600 sq mi 1,600 km2 basin area that contains the largest concentration of people in the state. The history of the Valley significantly intertwines with the history of the city of Las Vegas and one of the two primary cities as used by the census bureau in the MSA, with the other being Paradise. The valley is home to the three largest incorporated cities in Nevada: Las Vegas, Henderson and North Las Vegas.

The names Las Vegas and Vegas are used to indicate the valley, the strip, the city and are used as a brand by the Las Vegas Convention and Visitors Authority and used to denominate the entire region. The metropolitan area's population was at 741,459 in 1990. The population was approximately 2 million in 2010 estimated. The valley is an area generally defined by the Spring Mountains on the west, Sheep Mountains to the north, Muddy Mountains and Lake Mead to the east, and the Black Mountains to the south.

The area is known for its extensive gaming, shopping and fine dining offerings. Outdoor lighting displays are everywhere on the many tourist destination buildings in the area. Las Vegas, which bills itself as The Entertainment Capital of the World, is famous for the number of casino resorts and associated entertainment. Las Vegas is also home to a growing retirement community. As seen from space, Las Vegas is the brightest city in the world.

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