Several studies find, for instance, that when an electricity generator can choose between the output of many nearby coalmines that produce coal of a particular quality, it tends to buy its coal on an open market.

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But it's a very particular quality that's important about Luna.

BBC: Last Updated: Wednesday January 11 2006 09:25 GMT

Not only does online shopping provides consumers the convenience to shop from anywhere, it also allows them to better research a particular product for optimal quality and price.

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Should compensation be based on outcomes from specific events, or should it be based more of a general quality of a person not specific to a particular event?

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Even within a particular state, there can be big differences in the credit quality of municipal bonds.

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And recently, researchers in aquaculture (fish farming) have discovered that cottonseed meal makes a high-quality fish food.18 Catfish, in particular, appear to love cottonseed meal, and will eat it even when offered fish meal instead.

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Wednesday's first women's quarter-final saw a total of 110 unforced errors and was a low quality match for the most part, with Li in particular struggling for the best part of two sets.

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But there's one quality in particular that no nation can do without in such a time.

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When a recipe calls for so few ingredients, it is essential that you be particular about their quality.

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Yet, with all this high-quality content available to teachers, it is still nearly impossible to find content to use with a particular lesson plan for a particular grade aligned to particular standards.

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