>How might we measure it? That is a good question. A desire is a term of the mind, and it is not easily connected to the brain and physiology. The only one I c

>How might we measure it? That is a good question. A desire is a term of the mind, and it is not easily connected to the brain and physiology. The only one I can think of is the conscious desire to breathe - iirc, it is directly correlated to the amount of CO2 in the blood (not O2, the first suspect). We don't yet have strong correlates to hunger, for example, so it might take a while for other desires, but I would bet there would be some correlates. On the other hand, behavior can reveal a lot. Some economists would say we can find the strength of one desire by comparing it to another. How much of A are we willing to give in order to get some exact amount of B? It is not exactly measurement of desire, but we can end up with a list of priorities.