Commerce is the trading of something of economic value such as goods, services, information or money between two or more entities. Commerce is the central mechanism which drives capitalism and other economic systems. Commercialization is the process of transforming something into a product, service or activity which may be used in commerce.
Later, currency was introduced as a standardized money to facilitate a wider exchange of goods and services. Numismatists have collections of these monies which include coins from the earliest large-scale societies, although these were initially unmarked lumps of precious metalGold was an especially common form of early money, as described in Origins of Money and of Banking . The major advantage to commerce of circulating a standardized currency is that money overcomes the "Double coincidence of wants" necessary for barter trades to occur. For example, if a man who makes pots for a living needs a new house, he must hire someone to build it for him. But he cannot make an equivalent number of pots to equal this service done to him, and even if he could the house builder might not want the pots. Currency solved this problem by allowing values to be assigned to things so that goods and services can in a way be effectively collected and stored for later use, or split among several providers.
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Techniques and Styles :: Photography

APR Weather - Convective Development's comprehensive site for storm chasers and weather enthusiasts, includes AlertMe -- downloadable software that warns instantly of warnings, watches and advisories.
Meta Description: [ Convective Development and APR Weather provide free links to current and forecast weather information, also weather prediction and alerting software. ]
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Chaseone Storm Chase Page - Chase accounts and images from Bobby Eddins. Storm chasing links and information.
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Cloud 9 Tours - Join experienced storm chasers for two weeks of chasing down the best storms in the world.
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Cyclone Tours - Offers storm chasing vacations in Tornado Alley. Includes schedule, rates, logs and photographs, and profiles of the chase team.
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F5 Tornado Chasing Safaris - Tornado chasing safaris in the plains.
Silver Lining Tours - Operates Tornado chasing tours: includes storm logs; photographs and videos.
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Storm Chasing Adventure Tours - Tours from Oklahoma and Colorado: includes description of equipment and guides.
Striking Images - Specialized library of lightning photographs.
Meta Description: [ Stock photography on-line! We specialize in lightning and images of the Southwest. Visit our Internet thumbnail galleries to view the best of our 80,000-image library. ]
Tempest Tours Storm Expeditions - Tour profiles of rides with veteran storm chasers tracking nature's most spectacular weather.
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The Storm Shop - Offers stormchasing books, photos, and videos (including the Skywarn training series)
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Torando Alley Tour - Storm chasing tours in tornado alley.
Tornado Chase Day - A weather photography and stock image site, which includes images and stories about tornadoes and weather subjects.
Meta Description: [ Tornado Chase Day is a weather photography & stock image site. It includes images and stories about tornadoes and weather subjects. ]
Tornado Express Tours - Storm chasing in the Great Plains- Offering 6 and 10 day professional tornado chasing vacations in the Great Plains and Tornado Alley from April through July.
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Tornado Videos - Large collection of storm chase tornado videos including hurricanes and other severe weather events.
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Tradd Storm Chasing Tours - Offering storm chase tours since 1995. Includes chasing FAQs, photos, tour details, online booking, and a learning area.
Upper Midwest Chase Tours - Upper Midwest Chase Tours provides 1 day storm chasing vacations in Minnesota, Wisconsin, Iowa, South Dakota, and North Dakota.
Meta Description: [ Operates Tornado chasing tours: includes storm logs; photographs and videos of incredble storm chasing adventures in the heart of Tornado Alley. ]
Violent Skies, Inc. - Violent weather expeditions in Tornado Alley. Join a storm chasing trips and help search for the elusive tornado. Trip details, equipment used, and related news.
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Weatherstock Inc. - Weatherstock, Inc. maintains the world's largest collection of weather images, video and film. Includes images from professional storm chaser Warren Faidley.
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Western Winds Tours - Guided storm chasing adventures on the Great Plains with experienced guides.
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