Succeeding in a pluralistic market-based economy is no easy feat. The culture in which one is raised has a significant influence in preparing people for success. I suggest that those cultures that emphasize aligning to abstract principles, and encourage objective analysis, will produce people who are more successful than those cultures that emphasize personal pleasure or personal benefit to the exclusion of working for something outside the self.
Of course, this varies with particular families and circumstances. The culture is a larger influence that affects what families become, and then there are variations due to individual personalities. However, in thinking about the odds, the cultural history from which the individual emerges is a major factor.