The quantity and price measures presented in this article were prepared
using a newly developed database that contains detailed current-dollar and
price-index components and a refined algorithm for computing these measures.
Beginning with 1987, there are some differences between the fixed-weighted
price indexes that are calculated using these procedures and the fixed-weighted
indexes that are presently shown in the national income and product accounts
(NIPA's). See the headnote to the "Selected NIPA Tables" in
this issue for information about these differences and how they will be
incorporated into the NIPA tables.