Consider a market with network externalities, where demand is Q = 100 -1P. Let price initially be $30, where current demand without network externalities would be Q. = 130.00 - 2.00P. Suppose the price falls to $10, where demand without network externalities would be Q2 - 110.00 - 2.00P. With network externalities, the price change increases the quantity demanded by 20 units. (Enter your response using an integer.) Without externalities, the price change would have increased the quantity demanded by 40 units. Therefore, the network externality the quantity demanded by units