Effectual Reasoning: What Makes Entrepreneurs Entrepreneurial? (2008) [pdf]
effectuation.org
effectuation.org
Shameless plug: If you want a non-academic summary of the theory, a few months ago I wrote about it in my (former) company's blog: https://www.codelitt.com/blog/5-principles-of-successful-ent...
http://www.khoslaventures.com/wp-content/uploads/What_makes_...
As someone who's done a few entrepreneurial ventures and also has an MBA, the causal reasoning is indeed the default in most MBA programs.
https://blog.codinghorror.com/commandos-infantry-and-police/
A lack of responsibility does more to make it easier to take risks than does having money. It's pretty easy for a single healthy person to earn enough money to survive if it all goes wrong. It's a lot harder if that person has other people depending on them for survival.
But surely if one has family to look after money is a requirement to take that kind of risk.