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space trade
Space trade is interplanetary or interstellar trade. Futurists and pundits have been publishing plans and predictions about such trade since the 1960s. Science fiction writers have been envisioning such trade for much longer.
== Reality ==
Even if naturally no interstellar trade is known, there are surprisingly advanced theories developed by well known economists on how trade calculations and interest rates have to be adjusted in such hypothetical cases. At very high velocities, for example a space station traveling at significant speeds relative to the speed of light, there will be time dilation. In 2004 Espen Gaarder Haug published a technical research article in ''Wilmott Magazine'' on how interest rates and securities calculations had to be adjusted for very high velocities to avoid arbitrage. He published similar theories on what he called "SpaceTime Finance" in a book published in 2007 titled ''Derivatives Models on Models''. Paul Krugman, winner of the Nobel Memorial Prize in Economic Sciences, published a research article on interstellar trade in 2010.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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