While ladies are often heard complaining about their partners' unwillingness to commit, the problem in non-domestic matters is often just the opposite, according to a Stanford University study.
For example, once an analyst has given a stock a particularly optimistic or pessimistic rating, they will stick to their guns even when events prove them wrong.
As a sometime buyer of stocks, I think most investors are also guilty of hanging on to their dogs, hoping they will magically turn around and make them look like market wizards.
Same goes for hiring. Too often, I have procrastinated in dealing with someone who was clearly a bad fit for a position, refusing to acknowledge that the many fine qualities I had perceived in the screening interview were not in evidence on the job.
It seems to me that we're like that in many areas of life, remaining loyal to products and stores that no longer deserve our patronage, going back to hotels or restaurants we had recommended to others, even though the quality has now deteriorated.
The climate change deniers cling to their unsupported beliefs, even as there is evidence to the contrary all around, and on election day we're likely to vote for the same old party even though it has morphed into something quite different.
It's not just optimism, according to the study's authors, who say it has to do with our need to justify the time, effort or money we've committed to a previous course of action. We need to vindicate ourselves, so we stick to our position and hope we get lucky.