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- .../ref> [[science]] and [[research and development|research]].<ref>Arthur M. Diamond, Jr., [http://artdiamond.com/DiamondPDFs/PalgraveEconSci07.pdf Economics of5 KB (666 words) - 19:49, 2 January 2009
- ...unit or piece must be perceived as equivalent to any other, which is why [[diamond]]s, works of [[art]] or [[real estate]] are not suitable as money.22 KB (3,484 words) - 18:34, 8 January 2016