Social reciprocity is simply not present in the western mode of exchange Possessions, and exchanges, go beyond the limits of need. Radios, flashlights, batteries, cloth, lighters, etc. are sought after. Men often leave villages for months to pursue work that will give them money to buy goods that were previously non-existent in their culture or made by hand. Their absences disrupts village and family life. They are not present as husbands and fathers, or to hunt and fish.
Women are more likely to be seduced by other men.
Gender roles are less defined. The Yanomami have started making artifacts for sale to tourists. They work as guides, domestics, activists, and teachers. They are gaining money and prestige as individuals, not through kin relations or from experience. The Yanomami society is becoming stratified, based on possession and power.