Are there scientific theories of SWB?
There are lots of theories, but no powerful theory has emerged that can explain most of the data. There are theories about social comparison, about adaptation, and many other aspects of SWB, but each one of them seems to predict only some of the differences in happiness, and each of the theories thus far has been incompatible with at least some of the data. So the field is still in a theory-building stage. Beware of researchers who think that they have a broad theory that can explain everything about SWB. Many theories (e.g., the idea that people are less happy if they are around others who have more than they do) have proven oversimplified, or correct only in limited circumstances.
