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Airgeadas An teoiric gur athruithe randamacha iad na hathruithe i stocphraghsanna ó lá go lá. Tá na hathruithe neamhspleách ar a chéile agus tá an dáileadh dóchúlachta céanna acu go léir.
Finance Theory that stock price changes from day to day are at random. Changes are independent of each other and have the same probability distribution.