welfare though it may divert resources from governments to the private sector. In contrast, Faizul Latif Chowdhury, in 1999, suggested a production-substituting model of smuggling in which price disparity due to cost of supply is critically important as an incentive for smuggling. This price disparity is caused by domestic consumption-taxes and import duties. Drawing attention to the case of cigarettes, Chowdhury suggested that, in Bangladesh, smuggling of cigarettes reduced the level of domestic production. Domestic production of cigarettes is subject to value added tax (VAT) and other consumption tax. Reduction of domestic taxes enables the local producer to supply at a lower cost and bring down the price disparity that encourages smuggling. However, Chowdhury suggested that there is a limit beyond which reducing domestic taxes on production cannot confer a competitive advantage versus smuggled cigarettes. Therefore, government needs to upscale its anti-smuggling drive so that seizures (taking possession of person or property by legal process) can add to the cost of smuggling and thus render smuggling uncompetitive. Notably, Chowdhury modeled the relationship of the smuggler to the local producer as one of antagonistic duopoly. On the other hand, research by Tat Chee Tsui in 2016 suggests that even if increasing cigarette duty may encourage smuggling, total cigarette-consumption still declines because the price of illicit goods, as substitutes of taxed cigarettes, also increases because of higher tax rate. One economic view sees smuggling as monopoly-busting - as a challenge to state-sponsored restrictions or taxes on trade. Methods In smuggling, concealment can involve concealing the smuggled goods on a person's clothing, luggage or inside a body cavity. Some smugglers hide the whole transportation vehicle or ship used to bring the items into an area. Avoiding border checks, such as by small ships, private airplanes, through overland smuggling routes, smuggling tunnels and even small submersibles. This also applies for illegally passing a border oneself, for illegal immigration or illegal emigration. In many parts of the world, particularly the Gulf of Mexico, the smuggling vessel of choice is the go-fast boat. Submitting to border checks with the goods or people hidden in a vehicle or between (other) merchandise, or the goods hidden in luggage, in or under clothes, inside the body (see body cavity search, balloon swallower and mule), etc. Many smugglers fly on regularly scheduled airlines. A large number of suspected smugglers are caught each year by customs worldwide. Goods and people are