Just to expand on my own point, his theories owe a lot to Maslow's Hierarchy of Needs (http://en.wikipedia.org/wiki/Maslow%27s_hierarchy_of_needs http://en.wiki

Just to expand on my own point, his theories owe a lot to Maslow's Hierarchy of Needs (http://en.wikipedia.org/wiki/Maslow%27s_hierarchy_of_needs http://en.wikipedia.org/wiki/Maslow%27s_hierarchy_of_needs). You have to satisfy more "base" needs (shelter, salary, self-esteem) but the key motivator for intelligent people is opportunity for "self-actualization."