Chasing after sunk cost

One trait that distinguishes humans from animals is that humans care about 'sunk cost' while animals don't. There is actually serious research that underscores this: See paper. Basically, we humans tend to keep investing in lost causes simply because we have already invested in them. This is clearly self perpetuating - the more you invest, the more the unwillingness to pull away. Animals don't seem to exhibit this behavior - a predator chasing its prey will pull up and stop if the prey starts pulling away and not simply keep going because it has already chased the prey for a while. Marketers love to study such compulsions on the part of humans because it gives them insight into what kind of campaigns will succeed. I am wondering if this insight could apply to a number of our everyday actions.

Take the obsession with not wanting to "waste food." This is often used to justify shoving down that last morsel, well past the point of over eating. The sunk cost in the food is not going to come back whether the food is consumed or not. That starving child in Africa is not going to be satiated because you overate. Will consuming the food in a manner unlikely to yield the intended benefits really constitute "not wasting?" Or are we simply investing more resources (weight gain, bloating, indigestion, or whatever else one gets from over-eating) to justify the already sunk cost (of the prepared food)? Perhaps a more rational response would be to monitor what actually gets consumed and then prepare the next meal accordingly.

Another instance that may be particular to parenting goes as follows: you take the effort to plan an outing (park, zoo, beach, where ever) that you think will appeal to the kids. You get there and they are not that interested in the available activities. How do you respond? Many parents get all worked up and angrily announce that if they don't start cooperating and having some fun, then darn it, this is the "last time we'll ever take you anywhere!" Of course, it is the frustration talking and of course, part of it is for the effect - maybe this threat (even if clearly unenforceable) will get them to realize that all this effort was for them to have fun. I contend that this is just another case of taking on additional cost (loss of composure on your part, kids feeling bad about being yelled at, etc) in order to justify the sunk cost of planning and executing the outing. Better solution? Enquire calmly why they are not enjoying the outing. Suggest that they should have told you before you headed out. Remember this for the next time. Also, remember that kids don't always have to make sense - can we adults explain all our actions/reactions at all times? (ok, this last point doesn't have much to do with the main theme of this blog, but it kinda felt germane.)

My yoga master is often commenting on how humans have made their bodies slaves to their minds. I believe this is the fundamental cause for the above described irrational behavior. The positive thing is that we can use the power of that same mind to realize this and not repeat such actions. Can we really be totally rational? Of course not - that would make us robots and not very interesting. But watch out for the cases of chasing after sunk cost in your day to day life - I am willing to wager that you will find them to be more common than you might have expected.