Gas is plentiful but hard to move--hence, in most cases, much less valuable as it comes out of the ground.

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But as sure as darkness follows the light, spam text is about to cloud the cleanest online communications channel making it that much less trustworthy and valuable.

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Students are spending too much money to pursue credentials that are becoming less valuable.

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But they may not raise as much money as they had hoped, if only because the operations they want to float have become a lot less valuable than they were.

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Yet smaller opportunities with a much lower risk and commensurately lower payoff, pebbles if you like, are less attractive in the short term but more valuable in the long term.

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The new one gives out points based on how much you spend on a ticket, rewarding business passengers who fly coast-to-coast while making the benefits less valuable to passengers who might fly a lot but only bounce from Corpus Christi to Houston.

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