If all of a monopolist's costs are fixed costs, it will produce where demand is unit elastic

During a period of economic expansion, when expected profitability is high,

A) the demand curve for bonds shifts to the left. B) the supply curve of bonds shifts to the right. C) the equilibrium interest rate falls. D) the equilibrium price of bonds rises.

Some economists argue that there were good reasons for housing price to rise. Explain their argument

What will be an ideal response?