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People dislike lending valuable items fearing they will be damaged or not returned.
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oil
Cytosport is a very popular source for sports-oriented nutritional items. One might find items such as nutrition bars, shakes, and powders, including brand "Muscle Milk."
anything valuable
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I'd have to say trading cards.
Purchasing storage cupboards could be found from local cabinet stores. Searching the internet could also be a valuable source of information when searching for specific items.
A gift economy is one in which valuable items are transferred from one person to another as gifts. The ability to give valuable gifts publicly is a symbol of status.
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Family Heirlooms, items that are very valuable.
the signed lotto ticket