呵呵，这个东西在robert h.frank的《宏观经济学原理》（第三版）讲了。

和伯南克合写的那本？

其他的书里也有的，我记得布兰查德那本书的处附录里详细介绍了这个，可以去看看

是的。你真聪明！

我想知道啥意思.
这时高盛的解释,硬是没看懂.高人能给解释下吗

In 1995, the government began to calculate real GDP using “chain-weighted”
indexes, rather than the old “fixed-weight” measures. The advantage of the
chain-weight method is that it automatically rebalances the weights for
individual GDP components in the price base each year rather than allowing
the base year for this calculation to drift further into the past, which tended to
make the deflation from nominal to real data less statistically reliable. One
complication of the new system, however, is that individual components of real
GDP are no longer additive, as they were before.