i'm joined by jason weeden. the author of the hidden objective of the human mind. is self interest the dominant motive, jason? >> it's not the only motive, we looked at same sex marriage and abortion and income driks. distribution. we found out that self interest is much higher. >> aren't they voting against their own self interest? >> well, sure, there's a lot of noise in the system. any social science there are lots of exceptions. when the planet is warming you don't say, well, it was cold in d.c. last year. when we look at the data on tax and spend issues, it's wealthier people with tax and spend efforts, don't see any need for deposits to step in. whereas poorer people, are more in favor of tax and spend issues. >> is it money is it position is it something else? >> we have a pretty broad definition of self interest in our work. political sciences have often said it is short term economic self interest. we look at longer term interests, we also look at interests with social status, fights over discrimination and meritocracy, we think there are interests there, w