Well, I think there is grain of truth in this research... ...but, I measures only one variable, frankly irrelevant, without taking into account another one,whic

Well, I think there is grain of truth in this research... ...but, I measures only one variable, frankly irrelevant, without taking into account another one,which is amount of happiness these adopted kids have in their adult lifes for the amount of money they make. I mean, every person differs on scale how material he/she i, and that trait probably is inheritable. For example, USA has rather low quality of live compared to GDP per capita, but Canada is opposite - gives better quality of live with lower GDP per capita. However Canada has less opportunity to become super-rich. So when people choose where to immigrate to, depending on personality the can make choice. My point is - if these kids, who is as happy as their peers despite having lower income, that is very good, it means the spend less resources to "maintain lifestyle", less neurotic etc.