1、 Why
The historical-cost accounting model, which dominates financial reporting practice in most countries, does not account for changes in the purchasing power of the monetary unit that is used in the financial statements
As is evident in any historical-cost-based financial statement, when monetary amounts from different time periods are added there is an implicit assumption that these amounts are homogeneous and are additive
2、 How
The GPLA model attempts to account for changes in the general purchasing power of the reporting currency over time
Since it deals with general price changes, the model uses a summary measure of inflation such as a consumer price index
It aims to address an important weakness of the historical-cost model which ignores changes in the purchasing power of t