By taking the train, Alain can travel from Paris to Lille in one hour. The same trip takes 5 hours by bus. The train costs 80 and the bus 20. When Alain is not traveling, he can work and earn 25 per hour.

The opportunity cost of Alain for travelling by bus is145 and by train is___.

Answer:

Suppose "Ninecent" is a monopolist in providing communication services. The marker demand curve is P = 100 - Q, its total costs are TC = Q/2 + 100, and its marginal cost is given by: MC = 10 + Q.

The profit maximizing price for the monopolist is $ ... per unit.

Suppose Z is a normal good. The equilibrium price and equilibrium quantity of Z in the year 2013 was $25 and 60 units, respectively. In 2017, the equilibrium price of Z had decreased to $15 and the equilibrium quantity had also decreased to 50 units. Other things remaining the same, which of the following could explain this change?

a.A rightward shift of the supply curve of Z

b.A leftward shift of the supply curve of Z c.A rightward shift of the demand curve for Z d. A leftward shift of the demand curve for Z