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The answer is a boring metric of demand, distance, fuel costs.
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The e-rate offers a reduction on the price of monthly Internet access charges, wiring up classrooms, any special costs attaching to distance learning and basic telephone services.
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Unfortunately, this also costs time and distance.
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Even if you think the land was a bargain, bear in mind that it's pricier to build on an island, since materials, equipment and workers need to be shipped in, and those costs rise with distance from the mainland.
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Typically, capital costs will expand with distance from land and water depth and contract as the size of a project increases.
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The trip from Beijing to Shanghai, a distance of about 1, 120km, costs far more by road than it does to fly.
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In a nice touch, it provides estimates of the fuel costs for driving each stretch of distance, in case you want to alter your itinerary to incur less road time.
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Designing them to light up an entire room or shine a beam over a long distance is far more technically challenging and requires higher production costs.
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When Pritchett was on the tour, most events were within driving distance of one another, which helped keep transportation and accommodation costs low.
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Distance thus inhibits the south from taking advantage of its lower production costs.
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Road-pricing has long been championed by economists, keen to impose more of the external costs of driving on road-users by charging them a fee that reflects not just the distance travelled (which is loosely what gasoline taxes do) but also the time and route of the journey.
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That didn't work because rather than costs falling they rose under the new franchises, who also put prices up disproportionately on the long distance Anytime ticket.
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