Since the 1960s, anthropologist (and one-time penn state professor) napoleon chagnon has spent years studying the yanomamo indians of brazil and venezuela. he has lived with them, recorded much of their behavior, produced extensive genealogies, and conducted countless interviews. this research is an example of:

cohort study

Explanation:

Cohort study is a usually a long-term research inwhich the individuals share a common characteristics such as ancestry, date of birth amongst others. In cohort study, no treatment is administered or control group.

where's the

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.