In 2007, 296 million metric tons of iron ore were pulled from the mine. The mine is estimated to contain about 18 billion tons of iron ore, plus gold, manganese, copper, and nickel. The Carajas CarajÃ¡s mine sits in The carajas carajÃ¡s (Mountain range Serra) dos carajas CarajÃ¡s. in northeastern brazil
First, it think the phrase should be the net effect. Mixing up affect and effect  is a common error for both learners and native speakers of English. the net effect = the result in light of an important variable.
The expression network effect is applied most commonly to positive network externalities as in the case of the telephone. Negative network externalities can also occur, where more users make a product less valuable, but are more commonly referred to as congestion (as in traffic congestion or network congestion).hen a network effect is present, the value of a product or service is dependent on the number of others using it. The classic example is the telephone.