Contract law influences the decision to change one's mind
about keeping a promise.
One of the nice things about the culture of science is that it encourages one to change one's mind
if new information comes to light.
There were indeed plenty of reasons to change one's mind
about the future, including the secretary of the treasury's hint that the dollar would be allowed to fall free against the German mark in a kind of devaluation war and monthly data indicating that the economy was weaker than expected.
Making up one's mind, an essential skill of the past, may now be no more important than a new essential skill of the future--learning how to change one's mind
. A basic strategy for playing it safe in the past was to avoid change, but that may be the more risky strategy in the future.