I've read this book : https://www.amazon.com/Noble-Savages-Dangerous-Yanomamo-Anthropologists-ebook/dp/B006VJN2FE/ref=sr_1_4?s=digital-text&ie=UTF8&qid=14770160

I've read this book : https://www.amazon.com/Noble-Savages-Dangerous-Yanomamo-Anthropologists-ebook/dp/B006VJN2FE/ref=sr_1_4?s=digital-text&ie=UTF8&qid=1477016082&sr=1-4&keywords=Yanomamo https://www.amazon.com/Noble-Savages-Dangerous-Yanomamo-Anth... It seems as though even those tribes have been prizing western technology, like fishhooks, shotguns, and machetes. Those are valuable trade goods. Maybe they've sort of forgotten in the past few generations how to get by without those tools? Living in a jungle is hard as hell, and a machete and a shotgun sure do make a big difference.