My belief is that
Buffett uses the Treasury rate closest to the time period
he thinks he will hold the investment. At the 1998
meeting of Berkshire Hathaway, Buffett said, "We
dont discount the future cash flows at 9% or 10%; we
use the U.S. treasury rate. We try to deal with things about
which we are quite certain. You cant compensate for
risk by using a high discount rate."
The second point is that Buffett always assumes a "margin
of safety." So whether you discount by 5% or 6%
or 7% or perhaps even higher, the results should not have
a decisive effect on your buy/don't buy decision.
For the best description of his investing methods, Buffett
strongly recommended his book (organized by Larry Cunningham)
"The Essays of Warren Buffett."
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