Okay, so where is the criticism for this theory? Maslow's proposition is essentially that there is a universally applicable set of needs and that there is a universally applicable hierarchical ordering of those needs, but the empirical record for that is mixed. Sometimes, people don't find that there is really a particular set of needs that applies to different cultures. And in some case, they don't even see that there is a consistent hierarchical ordering of those needs. Some people have made the argument though, that in particular culture there's a tendency, there's this systematic tendency to value some needs over others. So, in collective societies, studies have found that people actually prioritize needs with regards to the group. So the the social needs, the belonging needs are a lot more important than the self-focused needs such as self-actualization. That’s lead people to say that maybe Maslow's theory has a Western bias, That is puts at the apex of the pyramid the self-actualization. But there are other influences that could also change the pyramid or the particular needs that people have. There could be situational pressures. So in many cases and studies have looked at this in war time and in peace time, the needs that people have and the priority ordering of those needs can be very different. I never had to live through a period of war, but I changed my ordering of needs when I started a family. So the prioritization or self-actualization versus safety all of a sudden changed. So safety had a much higher priority for me, because I now I had to be the reliable provider. And sometimes is really just idiosyncratic choices that people make and idiosyncratic tradeoffs that people make with regards to the ordering of the needs that they have. So many friends of mine that have worked on consultancy and investment banking actually have traded their high paying jobs and relative job