Consider a market with networkexternalities, where demand is

Q=1001P.

Let price initially be $40, where current demand without network externalities would be

Q1=140.002.00P.

Suppose the price falls to $20, where demand without network externalities would be

Q2=120.002.00P.

With networkexternalities, the price change increases the quantity demanded by ____units. (Enter your response using an integer.)

Withoutexternalities, the price change would have increased the quantity demanded by ____units.

Therefore, the network externality_(increases /decreases)________the quantity demanded by_____units.