Rationality

Is it possible for people to be rational about risk?
(by Frederic Gaspoz)
In the same way that 1 kilogram is always 1 kilogram and 1 hour is always 1 hour, risk can be measured, and a certain risk is always the same risk. Is it really like this? An object of 1 kilogram on earth has another weight on the moon. According to Einstein, even time is relative. For a young sportsman 1 kilogram is nothing, for an old lady 1 kilogram is heavy. Sometimes, for example when one is totally absorbed in something, an hour passes very quickly; another time, for example when one forces oneself to do something, one has perhaps the subjective feeling that the hour is endless. Also, risk is dependent on the reference system. Moreover, there is no objective physical measure for risk. Risk is a subjective construct and thus highly dependent on differences in individual perception and judgement.
Frederic Gaspoz