Imported cloth has meant that women no longer need to spin fiber taken from the jungle for whatever material they might have needed. But, cloth has to be washed and now they need soap. Salt, rejected by the Yanomami as late as 1979, is now essential in cooking. The dependency on non-Yanomami for tools they once made, and on the medicines needed to treat diseases they didn't use to have, has meant villages have become less nomadic in order to stay close to the source of those goods. Land around those stationary villages has become over tilled and hunted out.
Game is scarce, increasing dependency on outsiders.
More Yanomami migrate to villages with ready access Western goods than migrate out of them, further increasing the population and strain on the environment, and creating new bonds of cohesion, tension, and family and social patterns that the Yanomami have no experience dealing with. Purchasing products, instead of bartering for goods or making them themselves, requires money. To get money requires work for gain. Both concepts are new for the Yanomami and clash with their conceptions of labor as a social activity done for their own survival and the survival of their community. The intricate social patterns of trading and bartering were once highly ritualized, aiding in the formation and maintenance of social bonds.