After studying the practice of headhunting across different cultural groups, an anthropologist concluded that headhunting can be explained using a theory developed by economists. He argued that just...

QUestion-based on, "cultural groups".

I have tried it but confused.

Extracted text: After studying the practice of headhunting across different cultural groups, an anthropologist concluded that headhunting can be explained using a theory developed by economists. He argued that just like exchanging goods, headhunting is done to exchange one death with another. This anthropologist takes the approach to understand culture. etic emic