调价公式

FIDIC 调价：13.8 Adjustments forChanges in Cost In this Sub-Clause, “table of adjustment data” means the completed table of adjustment data for local and foreign currencies included in the Schedules. If there is no such table of adjustment data, this Sub-Clause shall not apply.If this Sub-Clause applies, the amounts payable to the Contractor shall be adjusted for rises or falls in the cost of labour, Goods and other inputs to the Works, by the addition or deduction of the amounts determined by the formulae prescribed in this Sub-Clause. To the extent that full compensation for any rise or fall in Costs is not covered by the provisions of this or other Clauses, the Accepted Contract Amount shall be deemed to have included amounts to cover the contingency of other rises and falls in costs.The adjustment to be applied to the amount otherwise payable to the Contractor, as valued in accordance with the appropriate Schedule and certified in Payment Certificates, shall be determined from formulae for each of the currencies in which the Contract Price is payable. No adjustment is to be applied to work valued on the basis of Cost or current prices. The formulae shall be of the following general type:Pn = a + b Ln/ Lo + c En/Eo + d Mn/Mo + ...... where:“Pn” is the adjustment multiplier to be applied to the estimated contract value in the relevant currency of the work carried out in period “n”, this period being a month unless otherwise stated in the Contract Data ;“a” is a fixed coefficient, stated in the relev ant table of adjustment data, representing the non-adjustable portion in contractual payments;“b”, “c”, “d”, … are coefficients representing the estimated proportion of each cost element related to the execution of the Works, as stated in the relevant table of adjustment data; such tabulated cost elements may be indicative of resources such as labour, equipment and materials;“Ln”, “En”, “Mn”, … are the current cost indices or reference prices for period “n”, expressed in the relevant currency of payment, each of which is applicable to therelevant tabulated cost element on the date 49 days priorto the last day of the period (to which the particularPayment Certificate relates); and“Lo”, “Eo”, “Mo”, … are the base cost indices orreference prices, expressed in the relevant currency ofpayment, each of which is applicable to the relevanttabulated cost element on the Base Date.The cost indices or reference prices stated in the table ofadjustment data shall be used. If their source is in doubt, itshall be determined by the Engineer. For this purpose,reference shall be made to the values of the indices atstated dates (quoted in the fourth and fifth columnsrespectively of the table) for the purposes of clarificationof the source; although these dates (and thus these values)may not correspond to the base cost indices.In cases where the “currency of index” (stated in the table)is not the relevant currency of payment, each index shallbe converted into the relevant currency of payment at theselling rate, established by the central bank of the Country,of this relevant currency on the above date for which theindex is required to be applicable.Until such time as each current cost index is available, theEngineer shall determine a provisional index for the issueof Interim Payment Certificates. When a current costindex is available, the adjustment shall be recalculatedaccordingly.If the Contractor fails to complete the Works within theTime for Completion, adjustment of prices thereafter shallbe made using either (i) each index or price applicable onthe date 49 days prior to the expiry of the Time forCompletion of the Works, or (ii) the current index orprice: whichever is more favourable to the Employer.The weightings (coefficients) for each of the factors ofcost stated in the table(s) of adjustment data shall only beadjusted if they have been rendered unreasonable,unbalanced or inapplicable, as a result of Variations.世行调价：Appendix 2. Price AdjustmentSample Price Adjustment FormulaPrices payable to the Contractor, in accordance with the Contract, shall be subject to adjustment during performance of the Contract to reflect changes in the cost of labor and material components, in accordance with the following formula:P P a b LLcMMP10101=⨯++-()in which:P1= adjustment amount payable to the ContractorP= Contract price (base price)a= percentage of fixed element in Contract price (a = %)b= percentage of labor component in Contract price (b = %)c= percentage of material and equipment component in Contract price (c = %)L 0, L1= labor indices applicable to the appropriate industry in the country of origin on the base date and the date for adjustment, respectivelyM0, M1= material and equipment indices in the country of origin on the base date and the date for adjustment, respectivelyN.B. a+b+c= 100%.Conditions Applicable To Price AdjustmentThe Bidder shall indicate the source of labor and materials indices and the base date indices in its bid.Item Source of Indices Used Base Date Indices The base date shall be the date twenty-eight (28) days prior to the Bid closing date.The date of adjustment shall be the mid-point of the period of manufacture or installation of component or Plant.The following conditions shall apply:(a) No price increase will be allowed beyond the original delivery date unlesscovered by an extension of time awarded by the Employer under the terms of the Contract. No price increase will be allowed for periods of delay for which the Contractor is responsible. The Employer will, however, be entitled to any price decrease occurring during such periods of delay., is expressed is different from the (b) If the currency in which the Contract price, Pcurrency of the country of origin of the labor and/or materials indices, a correction factor will be applied to avoid incorrect adjustments of the Contract price. The correction factor shall correspond to the ratio of exchange rates between the two currencies on the base date and the date for adjustment as defined above.(c) No price adjustment shall be payable on the portion of the Contract price paid tothe Contractor as an advance payment.。