|Unit||Index 2011=100, NSA|
|Adjustments||Not Seasonally Adjusted|
|Source||Directorate General of Budget, Accounting and Statistics (DGBAS) - Taiwan|
|Release||Wholesale Price Index|
The Wholesale Price Index measures the average changes in selling prices of materials, semi-finished and finished goods, for Taiwan.
The Wholesale Price Indices (WPI) comprise the Domestic Wholesale Price Index (DWPI), Import Price Index (IPI) and Export Price Index (EPI). The Wholesale Price Indices is weighted average of these three indices. All are Laspeyres indices with a fixed base year.
The Wholesale Price Indices covers 1123 items: DWPI covers 575 items, IPI covers 273 items and EPI covers 275 items. The most prices are collected through a monthly mail survey or Internet Reporting System. The designated companies report the actual selling prices of selected commodities with the same specification (in principle, price after adjustment for rebate, tax, shipment, etc.) around the 20th of each month.
The weights of DWPI are obtained from the Industrial Production Statistics, National Income Statistics and data provided by relative associations. For non-manufacturers (Agriculture, Mining, Forestry, Fishing, Water Supply, etc.), the weights are referred to Year books of Agriculture, Mining, Forestry, Fishing, Water Supply and Electricity. The weights of IPI and EPI are based on the customs-clearing values of import (or export) goods of 2006, including re-imports (re-exports). The values of import (export) items outside the sample being added proportionally to that of surveyed items similar in attributes and price trends.
The indices as a whole are normally re-based about five years and the weights are changed at a five-yearly intervals.
Seasonally adjusted and unadjusted indices are provided.
All seasonally adjusted and unadjusted WPI are routinely subject to revision for 3 months after original publication. Indices are revised to reflect late reports and corrections received from respondents. The data become final three months after initial publication. Besides, the seasonally adjusted monthly data for the previous 5 years are revised at the time of the release of the March WPI.
Major program changes are made on WPI re-basing every five years. As soon as the re-basing process is finished, the new results are announced at the upcoming February that the January data are released.