this problem is also solved in the 3rd one:

送交者: mangolasi 于 2008-03-25, 13:34:41:

回答: causality not clear 由水手于 2008-03-25, 11:37:05:

"If you feel "pretty well off", you may feel like giving."

the 3rd one can randomly assigned the task of spending/giving in theory.