#576301
Tugtar le tuiscint le haistreacht gurb ionann an PCC díreach idir thíortha A agus C agus PCC indíreach arna dhíorthú trí PCC díreach idir thíortha A agus B (nó aon tríú tír) a iolrú faoi PCC díreach idir thíortha B agus C. Níl PCCanna Fisher ar leibhéal an bhun-cheannteidil aistreach, ach is féidir iad a dhíorthú ó shraith PCCanna aistreacha atá cosúil le hinnéacsanna bunaidh Fisher, agus critéar na n-íoschearnóg a úsáid.
Transitivity implies that the direct PPP between countries A and C is equal to the indirect PPP derived by multiplying the direct PPP between countries A and B (or any other third country) and the direct PPP between countries B and C. The Fisher PPPs at BH level are not transitive, but it is possible to derive from them a set of transitive PPPs that resemble the original Fisher indices, using the criterion of least squares for this purpose.