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Ruith-airgid
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'S e ruith-airgid seòrsa de dh'airgead airson nithean a cheannach.
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Mar as àbhaist, 's e ruith-airgid fiat a tha daoine a' cleachdadh. Dh'òrdaich an riaghaltas no banca oifigeil gur e airgead a tha ann. Gu h-eachdraidheil bha ruith-airgid bhathar-amh, far an do chleachd daoine stuth mar òr no faoiteagan mar ruith-airgid, no ruith-airgid riochdachail, far an do riochdaich nòtaichean no cùinntean òr a bha ann am banca, nas cumanta.