ECON3020J EXAM 1
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ECON3020J EXAM 1
Consider the following model.
Agents live for two periods. Generation t is born and “Young” at time t. Generation t is “Old” at time t + 1 . The population born at time t is Lt .
Each young person is endowed with one unit of labor and saves a constant fraction 1 − u of his or her wage wt . The old person does not work and consumes all their savings. Population grows at a rate n.
The production function is Yt = AKLt(#)$" .
In addition to physical capital K, there is a financial asset called Bubblecoin. Bubblecoin does not pay any dividends and thus has no intrinsic value. The total number of Bubblecoins at date t is Bt and it grows at rate p
Bt%# = Bt (1 + p)
We try to construct a trajectory of the economy such that Bubblecoin are valued. Let qt be the price of one Bubblecoin at date t. Let rt be the real interest rate between t - 1 and t. Young can save in terms of physical capital and financial asset.
1. Show the consumption when young c#,t , of a consumer born at t as a function of kt , bt , qt and wt .
2. Show the consumption of the above person when old c2,t%# .
3. What are competitive equilibrium values of r an d w .
4. Show/Justify that one must have
(1 − u)wt Nt = Kt%# + qt Bt
(Use economic intuition and you only need 1 or 2 sentences).
5. From the above equation and think about when consumers would hold Bubblecoin, conclude that for Bubblecoin to be valued in equilibrium it must be that their growth rate satisfies
p ≤ − 1
(Hint: Introducing growth rates into the equations. It might be helpful if you remember some knowledge from the Solow model).
6. Under which condition the existence of Bubblecoin is rational?
2022-09-27