The solar costs decrease continues a 10 year trend of lower and lower costs.

太阳能成本的下降延续了近十年降价趋势。

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Learning curve theory states that as the quantity of items produced doubles, costs decrease at a predictable rate.

学习曲线理论说随着生产的产品数量翻倍，成本以可估的比率下降。

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Third, its margins will improve as its costs decrease and it rolls out more deals with enterprises as opposed to individual consumers.

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If that happens, transactional costs could decrease, particularly if the markets push for more electronic trading.

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This caused an increase in its costs and decrease in its profit margins.

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