Sentence 1: For alternative measures including changes in the market value of households' existing assets, see William G. Gale and John Sabelhaus, Perspectives on the Household Saving Rate, Brookings Papers on Economic Activity (1:1999), pp. 181-224; and Richard Peach and Charles Steindel, A Nation of Spendthrifts?

Sentence 2: Changing the values is a preferred method.

If the first sentence is true, then is the second sentence true?
it is not possible to tell