laspeyres index การใช้

• Before that it had used the Laspeyres index, a fixed-weight method.
• The first to use weighted index numbers, Lowe in effect anticipated the Laspeyres index.
• Similarly, the Laspeyres index can be thought of as a price index taking the bundle of goods using current prices and base period quantities as the numeraire.
• In " Updated Summary of NIPA Methodologies " ( 2006 ), they seem to describe real GDP as being calculated as a Laspeyres index with base year 2000:
• Thus the index is a fixed-weight index, but rarely a true Laspeyres index, since the weight-reference period of a year and the price-reference period, usually a more recent single month, do not coincide.
• The Laspeyres index tends to overstate inflation ( in a cost of living framework ), while the Paasche index tends to understate it, because the indices do not account for the fact that consumers typically react to price changes by changing the quantities that they buy.
• Specifically, in this case, a Laspeyres index, where the " base " of the index is the sum of all of the prices of a fixed basket of goods in the base year multiplied by the quantity of the basket of goods in the base year.
• When applied to bundles of individual consumers, a Laspeyres index of 1 would state that an agent in the current period can afford to buy the same bundle as she consumed in the previous period, given that income has not changed; a Paasche index of 1 would state that an agent could have consumed the same bundle in the base period as she is consuming in the current period, given that income has not changed.