Graduate Macroeconomics 2


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1 Graduate Macroeconomics 2 Lecture 1  Introduction to Real Business Cycles Zsófia L. Bárány Sciences Po 2014 January
2 About the course I. 2hour lecture every week, Tuesdays from 10:1512:15 2 big topics covered: 1. economic fluctuations 2. unemployment office hour by appointment, in office E lecture notes will become available weekly before the lecture
3 About the course II. besides the lectures, there will be classes every Monday afternoon tutorials in 3 groups for most of the classes you will have to solve problem sets you will have to hand in 2 problem sets, these will constitute 30 percent of your final grade you will receive the solution to the problem sets
4 Let s start!
5 Why study business cycles? last term you studied longrun growth clearly a very important determinant of welfare now we will look at shortterm fluctuations why do we care about these? fluctuations are unpleasant especially increases in unemployment and inflation governments tend to want to dampen these cycles we need to understand the driving forces behind the fluctuations of the economy
6 A veryvery brief history 1. the Great Depression and Keynes Keynes: shortrun rigidity of wages (and prices) stable equilibrium with unemployment possible aggregate demand is the key government intervention others formalized his ideas: the IS (investment and saving) LM (money demand and supply) model later addition: Phillips curve  tradeoff between inflation and unemployment similar much bigger models with several hundred equations these models are based on empirically observed relationships between: output and consumption, money demand, inflation, unemployment, etc the aim of these models was to predict the effects of policies they were pretty successful at it until the 1960s
7 A veryvery brief history 2. the Neo Classicals monetarism  Friedman permanent income hypothesis small fiscal policy multipliers bad monetary policy causes economic fluctuations (not animal spirits ) prescription: steady growth in monetary aggregates Phillips curve relationship does not hold in the long run money is neutral it appears in the short run due to unanticipated inflation and money illusion the rational expectations revolution  Lucas Keynesian empirical relationships estimated given a policy for an alternative policy the relationship would be different due to changes in expectations Keynesian models not suitable for policy evaluation monetary policy only matters if it surprises people systematic monetary policy aimed at stabilizing the economy will not work
8 A veryvery brief history 3. the Neo Classical Real Business Cycle Theory prices adjust instantaneously to clear markets economic actors optimize, and are forward looking rational expectations cause of fluctuations: random shocks to technology key mechanism: intertemporal substitution in consumption and leisure as a response to these shocks today: methodological contribution is most emphasized important to assess how close reality is to a perfectly working, frictionless environment to understand the importance of market imperfections
9 A veryvery brief history 4. the New Keynesians general disequilibrium tools of general equilibrium to analyze the allocations of resources when markets do not clear how does the not clearing of one market influence supply and demand in another market fixed prices and wages different regimes can arise, i.e. Keynesian regime excess supply in goods and labor rational expectations without market clearing systematic mon policy can stabilize the economy why don t wages and prices clear the markets? menu costs efficiency wages wage and price setters aren t perfectly rational market power wedge between privately and socially optimal price adjustment
10 Dynamic Stochastic General Equilibrium (DSGE) models D some things don t make sense in static models (for example: investment) relatively shortterm analysis S shocks hit the economy, and force it off the balanced growth path (BGP) fluctuations do not mean disequilibrium, this is the reaction of the economy to an outside shock G E this is macro the models are based on perfectly/monopolistically competitive markets optimizing agents the economy is in EQUILIBRIUM microfounded models There are different schools of thought...
11 METHODOLOGICAL DIFFERENCES SUBSTANTIVE DIFFERENCES supply shocks demand shocks rigidity simple SALT WATER aim: models/ A L α K 1 α contributed what see the qualitative growth model is important mechanisms insights RIGIDITY very clearly complex FRESH WATER now there is models contributed more harmony transparency quantitative the in macro is the cost matching METHODOLOGY we are going to start here, because it is easier
12 Path to get there: 1. real business cycle (RBC) models 2. introduce market power  New Keynesian (NK) model introduce money 4. introduce nominal rigidities  NK model 2. The predictions in the end are not very different from the ISLM. However, better sense of the role of distortions of optimal policy
13 Business Cycle Facts I. properties of quarterly detrended macro time series x t = log(x t ) log(xt ) is the percentage deviation of variable X from its trend, X how is the trend defined? (you have seen this in class yesterday) first linear now more sophisticated bandpass filter growth theory serves as a guidance
14 Business Cycle Facts II. look at the highest correlation with GDP ρ(x t, y t+k ) k = 6, 5,..., 0,...5, 6 if ρ > 0, then x is procyclical if ρ < 0, then x is countercyclical if k < 0, then x lags behind output if k > 0, then x leads output
15 Business Cycle Facts III. Series Standard deviation Correlation with GDP Lag y c i g hours n tfp w P everything quite procyclical except: government spending does not seem to support the statement that the cause if BC is gov spending real wage is mildly procyclical big problem in many models aggregation bias: average wage evolves differently than the wage of a continuously employed worker
16 Business Cycle Facts IV. Standard deviations (unit of measure is percentage deviation from trend) they are comparable GDP is more volatile than consumption investment is much more volatile than GDP government spending is pretty volatile working hours is almost exactly as volatile as GDP vast majority of the volatility of working hours is explained by the employment volatility weird, because it should be cheaper to adjust the working hours of employees than to hire/fire people TFP is very volatile school of thoughts disagree whether this is a cause or consequence of business cycles
17 Basic model Start with the most basic model, has to contain uncertainty in the form of productivity shocks consumption/saving choice Ramsey model with two modifications: discrete time stochastic, due to technological shocks Many limitations: infinite horizon, no heterogeneity, no money, no labor/leisure choice Good starting point: analyze the effect of shocks, propagation mechanisms, consumption smoothing, show equivalence of centralized/ decentralized economy
18 The centralized problem subject to max {C t+i,s t+i,k t+i+1 } i=0 ( ) E t β i U(C t+i ) i=0 C t+i + S t+i Z t+i F (K t+i, 1) K t+i+1 = (1 δ)k t+i + S t+i K t+i+1 0; K 0 > 0 given CRS production: F (λk, λl) = λf (K, L) for every λ > 0 usual conditions: F (0, L) = 0, F 1 > 0, F 2 > 0, lim K 0 F 1 (K, L) =, lim K F 1 (K, L) = 0 utility: U > 0, U < 0, lim c 0 U (c) = Z t random variable with mean Z goal: understand the dynamic effect of Z on Y, C, S
19 The first order conditions Combining the two constraints we get: K t+i+1 (1 δ)k t+i + Z t+i F (K t+i, 1) C t+i There are two options now: 1. Solve the problem as it is with the Lagrangian The Lagrangian can be written as: L = E t i=0 βi U(C t+i ) E t i=0 βi λ t+i (K t+i+1 (1 δ)k t+i Z t+i F (K t+i, 1) + C t+i ) note: (1) Lagrange multiplier β i λ t+i rather than just λ t+i purely for convenience (2) the nonnegativity constraints on K t are obviously not binding (why?), hence they are omitted from the Lagrangain
20 L =E t Expand the Lagrangian by writing out the t + i and t + i + 1 terms: i=0 E t i=0 β i U(C t+i ) β i λ t+i (K t+i+1 (1 δ)k t+i Z t+i F (K t+i, 1) + C t+i ) = ( E t U(Ct ) + βu(c t+1 ) +...β i U(C t+i ) +... ) E t λ t (K t+1 (1 δ)k t Z t F (K t, 1) + C t ) E t βλ t+1 (K t+2 (1 δ)k t+1 Z t+1 F (K t+1, 1) + C t+1 )... E t β i λ t+i (K t+i+1 (1 δ)k t+i Z t+i F (K t+i, 1) + C t+i ) E t β i+1 λ t+i+1 (K t+i+2 (1 δ)k t+i+1 Z t+i+1 F (K t+i+1, 1) + C t+i+1 )...
21 Take the derivative with respect to C t+i : L C t+i = E t (β i U (C t+i ) E t (β i λ t+i )) = E t (U (C t+i )) E t (λ t+i ) = 0 there is one optimum condition on C for each time period, i.e. i = 0, 1, 2,... Take the derivative with respect to K t+i+1 : L K t+i+1 = E t (β i λ t+i β i+1 λ t+i+1 ((1 δ) + Z t+i+1 F 1 (K t+i+1, 1))) = E t (λ t+i βλ t+i+1 ((1 δ) + Z t+i+1 F 1 (K t+i+1, 1))) = 0
22 The first order conditions for every time period (every i 0) are: L C t+i = E t (U (C t+i )) E t (λ t+i ) = 0 L K t+i+1 = E t (λ t+i βλ t+i+1 ((1 δ) + Z t+i+1 F 1 (K t+i+1, 1))) = 0 By defining R t+i+1 (1 δ) + Z t+i+1 F 1 (K t+i+1, 1) as the return on capital, we get the following two conditions for i = 0: U (C t ) = λ t λ t = E t (βλ t+1 R t+1 )
23 intuition: U (C t ) = λ t λ t = E t (βλ t+1 R t+1 ) the marginal utility of consumption must equal the marginal value of capital the marginal value of capital must equal the expected value of the marginal value of capital tomorrow times the gross return on capital, times the subjective discount factor Putting the two together we get the Euler equation: U (C t ) = E t (βr t+1 U (C t+1 ))
24 2. Simplify the model further Remember that the constraint was: K t+i+1 (1 δ)k t+i + Z t+i F (K t+i, 1) } {{ } f (K t+i ) C t+i Define f (K t+i ) (1 δ)k t+i + Z t+i F (K t+i, 1), the problem can be written as (why?): ( ) max E t β i U(f (K t+i ) K t+i+1 ) {K t+i+1 } i=0 subject to 0 0 K t+i+1 f (K t ); K 0 > 0 given These constraints are obviously not binding. The FOC for i = 0 is: U (f (K t ) K t+1 ) = E t (βf (K t+1 )U (f (K t+1 ) K t+2 )) This is another version of the Euler equation.
25 A variational argument for the Euler equation U (C t ) = E t (βr t+1 U (C t+1 )) on the optimal path a consumer should be indifferent between reducing his consumption by ε today and using the savings for consumption in the next period saving ε today reduces utility by U (C t )ε today the ε saving today is worth E t (R t+1 )ε tomorrow which increases the consumers utility by E t (R t+1 U (C t+1 ))ε tomorrow the present value of this future increase in utility is E t (βr t+1 U (C t+1 ))ε
26 We saw that the Euler equations are necessary conditions for optimality. But are they sufficient as well? The Euler equations check for unilateral variations on the optimal plan. They require that for t 0 U(f (K t ) K t+1 ) + βu(f (K t+1 ) K t+2 ) U(f (K t ) K t+1 ) + βu(f (K t+1 ) K t+2 ) for K t+1 such that 0 K t+1 f (K t ) and 0 K t+2 f (K t+1) However, the problem is infinite, and the Euler equation does not check for a deviation in all periods.
27 The transversality condition FOC only check for one period deviations need to check in addition the transversality condition: if an interior sequence {Kt+1 } t=0 satisfies the Euler equations (given K 0 ) and lim T βt U (f (KT ) K T +1 )f (KT )K T 0 then it is a globally optimal sequence under some assumptions (functions U and f bounded, increasing, continuous, concave, and differentiable) Intuition: FOCs are sufficient for global finite period optimality. What about infinite deviations? Since β T U f is the t = 0 price of capital K T, if lim T βt U (f (KT ) K T +1 )f (KT )K T > 0 then the agent is holding valuable capital, i.e. the value of capital has not been exhausted and perhaps his utility can be increased
28 The optimal solution to the centralized problem Is fully characterized by a sequence of Kt+1 for t 0 which satisfies the Euler equation: U (f (Kt ) Kt+1) = E t (βf (Kt+1)U (f (Kt+1) Kt+2)) the transversality condition: lim T βt U (f (KT ) K T +1 )f (KT )K T 0 feasibility given K 0 > 0 0 K t+i+1 f (K t )
29 The decentralized economy To formulate the decentralized problem we have to decide whether firms rent or buy the capital how firms are financed (through retained earnings, bonds, equity) Here I assume that the capital is owned by the consumers, who rent out the capital to firms. main assumption: the goods, labor and capital markets are perfectly competitive
30 Firms firms technology as before: Y t = Z t F (K t, L t ), where F (, ) is CRS: F (λk t, λl t ) = λf (K t, L t ) firms rent labor and capital; their profit is therefore given by π t = Y t W t L t R t K t where they take the rental rate, R t, and the wage rate, W t as given firms maximize their profit each period, which implies: π t L t = Z t F 2 (K t, L t ) W t = 0 MPL = W t π t K t = Z t F 1 (K t, L t ) R t = 0 MPK = R t
31 Consumers consumers maximize the PV of lifetime utility from consumption E t i=0 β i U(C t+i ) supply one unit of labor inelastically in a competitive labor market, for wage W t in period t saving (S t ), is only by accumulating capital, which is rented out to firms every period in a competitive market for rental services, at rental rate R t the consumers own the firms (in equal shares), and receive all profits the total amount of labor supplied is equal to the measure of consumers, we can normalize this: L t = 1
32 To derive the budget constraint of consumers, we need to calculate the profit of the firms. We will show that if there is perfect comp & CRS prod function firms profits = 0 The profit of the firm is: π = Z F (K, L) RK WL 1. for a CRS function the following holds: f (λa, λb) λ = λf (a, b) λ = f (a, b) 2. now find f (λa,λb) λ, denote λa a and λb b: f (a,b) λ = = f (a,b) a a λ f (a,b) a a + + f (a,b) b f (a,b) b b b λ
33 3. this is true for λ = 1 as well, which implies a = a and b = b: f (a, b) λ = f (a, b) a + a 4. according to (1) this also implies: f (a, b) = f (a, b) a + a f (a, b) b b f (a, b) b b Applying this to our production function: Z F (K, L): Z F (K, L) = Z F (K,L) K K + Z F (K,L) L L = Z F 1 (K, L)K + Z F 2 (K, L)L = RK + WL Plugging this into the profit function, we see that it is zero.
34 the period t budget constraint of the consumer is therefore given by: S t + C t R t K t + W t + π t }{{} =0 the evolution of capital is given by K t+1 = (1 δ)k t + S t the consumer s problem can be summarized as: subject to max E t {C t+i,s t+i,k t+i+1 } i=0 i=0 β i U(C t+i ) S t+i + C t+i = R t+i K t+i + W t+i K t+i+1 = (1 δ)k t+i + S t+i K t+i 0; K 0 > 0 given
35 denote by R t 1 + R t δ the return on capital; merge the budget constraint (with equality (why?)) and the law of motion for capital to get: C t = R t K t + W t K t+1 the objective function of the consumer can then be reformulated to get: max E t {K t+i+1 } i=0 i=0 β i U(R t+i K t+i + W t+i K t+i+1 ) where K 0 > 0 is given and 0 K t+i+1 R t+i K t+i + W t+i (which again is not binding) the first order condition for i = 0 is then: U (C t ) = E t (R t+1 βu (C t+1 ))
36 Equivalence Using the fact that R t = Z t F 1 (K t, 1) and that R t = 1 δ + R t we get: U (C t ) = E t (β(1 δ + Z t+1 F 1 (K t+1, 1))U (C t+1 )) which is the same as the previous Euler equation. Using the budget constraint of the consumer: K t+1 = (1 δ)k t + R t K t + W t C t = (1 δ)k t + Z t F 1 (K t, 1)K t + Z t F 2 (K t, 1) C } {{ } t =Z tf (K t,1) = (1 δ)k t + Z t F (K t, 1) C t which using perfect competition and the CRS property of F is the same as under the planner s problem.
37 The nonstochastic steady state in the nonstochastic steady state C and K are constant (as there is no growth): C t = C t+1 = C also R = 1 δ + ZF 1 (K, 1) from the Euler equation: U (C ) = βr U (C ) βr = 1 1 δ + ZF 1 (K, 1) = 1 β This gives us the optimal level of capital, K. The condition can be rewritten as: ZF 1 (K, 1) δ = 1 β β and the optimal C is given by: ZF (K, 1) δk = C
38 The effects of an unexpected increase in Z? An increase in Z has two opposing effects on C: Income effect : higher C due to the increase in production, as ZF (K, 1) is higher with the same K Intertemporal substitution effect : lower C due to consumption shifting towards the future EE: U (C t ) = E t (β(1 δ + Z t+1 F K (K t+1, 1)) } {{ } R t+1 U (C t+1 )) as Z is higher βr t+1 is higher incentive to save
39 net effect on C ambiguous, depends on the utility function S, I unambiguous increase Y increase, and further increase over time if increase in Z is transitory C up less, I up more for less time good news: positive comovements
40 The effects of shocks Solving the model is very hard, there are several approaches one can take: 1. very special cases, which we can solve explicitly results may be misleading 2. linearize or log linearize, get an explicit (numerical or analytical) solution lose nonlinearities 3. formulate a stochastic dynamic programming problem, and solve numerically might not work not covered in this course 4. ignore uncertainty, use continuous time and solve with phasediagram lose interesting effects of uncertainty not covered in this course
41 1. A very special case U(C t ) = log C t Z t F (K t, 1) = Z t K α t δ = 1 HW: Find the solution to this problem, and give an intuition for it for next week s class.
42 2. Loglinearization The first order conditions (FOCs) are a nonlinear system of equations. The main idea is that loglinearizing the model around its steady state gives a system of linear equations, which then can be solved in many ways. Have to follow these steps: 1. write down the FOCs that govern the model 2. solve for the nonstochastic BGP 3. rewrite the model in terms of log deviations from the nonstochastic BGP 4. study this alternative model, which is loglinear, and an approximation of the original model around the nonstochastic BGP We will go over this in detail two weeks from now.
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