# Graduate Macro Theory II: Notes on Investment

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1 Graduate Macro Theory II: Notes on Investment Eric Sims University of Notre Dame Spring Introduction These notes introduce and discuss modern theories of firm investment. While much of this is done as a decision rule problem of the firm, it is easily incorporated into a general equilibrium structure. 2 Tobin s Q Jim Tobin 1969 developed an intuitive and celebrated theory of investment. He reasoned that if the market value of physical capital of a firm exceeded its replacement cost, then capital has more value in the firm the numerator than outside the firm the denominator. Formally, Tobin s Q is defined as: Q = Market Value of Firm Capital Replacement Cost of Capital Tobin reasoned that firms should accumulate more capital when Q > 1 and should draw down their capital stock when Q < 1. That is, net investment in physical capital should depend on where Q is in relation to one. How would one measure Q in the data? Typically this is done by using the value of the stock market in the numerator and data on corporate net worth in the denominator here net worth is defined as the replacement cost of capital goods. For example, suppose that a company is in the business of bulldozing. owns a bunch of bulldozers. Suppose that it owns 100 bulldozers, which cost 100 each to replace. This means its replacement cost is 10, 000. Suppose it has 1000 outstanding shares of stock, valued at 15 per share. The market value of the firm is thus 15, 000 and the replacement cost is 10, 000, so Tobin s Q is 1.5. Since bulldozers are worth more in the firm than outside the firm the market evidently values each unit of capital inside the firm at 1.5 times its market value, the firm should evidently buy more bulldozers. One might be able to immediately point out an issue with this logic. Economic decisions should be made at the margin the firm should buy another bulldozer if the marginal value of the bulldozer 1 1

2 in the firm exceeds the amount it costs to buy it. Tobin s Q is an average value it is the average value of capital inside the firm relative to capital on the outside e.g. normalizing the price of the capital good to be one, it is V k, where V is total firm value. What really ought to matter for investing decisions is V k i.e. marginal Q, not average Q. 3 Convex Adjustment Costs: Partial Equilibrium Consider the problem of a firm that owns its capital stock. The real interest rate is fixed at r, and firms discount future profits by 1 1+r. The firm produces output using capital and labor according to a constant returns to scale Cobb-Douglas production function. takes the real wage as given. The firm owns its capital stock. Aside from the foregone profits of 1 the relative price of investment is 1, there is potentially an additional cost of net investment, given by the following function: Φ We assume that Φ has the following properties: Φ > 0, Φ 0, Φδ = 0, and Φ δ = 0. In words, the function is increasing, concave, is equal to 0 at δ, and has first derivative equal to 0 at δ. In words, the firm must pay an increasing and convex cost of net investment. Net investment is given by I t δ i.e. investment over and above what is necessary to replace depreciated capital. This cost is measured in terms of units of current capital. If the firm has a lot of capital, then the cost of net investment will be high relative to if the firm does not have much capital. The idea here is that is the firm has to not run some of its machines while it installs new machines i.e. it can t produce as much. The more machines its has, the more costly this is. The firm s problem can be written: max I t,+1,n t V 0 = E 0 t=0 1 a t f, n t w t n t I t Φ 1 + r s.t. +1 = I t + 1 δ Set up a Lagrangian. Denote the multiplier on the constraint by q t. L = E 0 t=0 1 a t f, n t w t n t I t Φ 1 + r The first order conditions are: + q t I t + 1 δ +1 2

3 L = 0 q t = r E t a t+1 f k +1, n t+1 Φ +1 T V : L = 0 a t f n, n t = w t 2 n t L = 0 q t = 1 + Φ 3 I t + Φ + 1 δq t T lim E t q t+t +T +1 = 0 5 T 1 + r What exactly is q t and what does it measure? is the shadow value of the constraint, it is how much the firm would value having the constraint relaxed. Suppose that the firm has optimally chosen +1 given the state variables. Having the constraint relaxed means having one more unit of installed capital, or one more unit of +1. Since this doesn t affect the optimal choice of +1 since the firm has already optimized, this means the firm will simply reduce current investment by 1 this is an envelope type argument. This is valuable to the firm for two reasons. First, it means the firm has to do one fewer unit of investment today, which directly increases current profits by 1. Secondly, doing one fewer unit of investment reduces costs associated with adjustment by Φ, which also raises current profits. The total value in terms of current profits of having an extra unit of +1 is thus given by 2. In other words, q t = V 0 +1 along an optimal path i.e. the marginal value of an additional unit of capital. The transversality condition says that the present value of any capital left over at the end of time is equal to zero. 3 gives another expression for q which is very intuitive. This can be solved forward using the transversality condition to get: q t = E t 1 1 δ j=1 1 δ j +j a t+j f k +j, n t+j Φ + Φ +j +j 1 + r +j +j +j This says that current q must also equal the present discounted value of the marginal profits of having an extra unit of +1. The effective discount rate is by both the depreciation rate and r because the extra unit of +1 depreciates through time. The direct benefit of an extra unit of +1 is to have 1 δ j 1 a t+j f k +j, n t+j extra units of revenue at time t + j you have 1 δ j 1 extra units of capital at time t + j, which yields marginal product a t+j f k +j, n t+j. There is also an indirect effect - having more +1 reduces the installation costs. Having 1 δ j 1 extra units +j of capital at time t + j reduces installation costs by +j. Hence, q t Φ +j = Φ +j +j +j +j Φ is also the present discounted value of having an extra unit of capital, measured in terms of future marginal products and reductions in installation costs. 3.1 q and Investment The first order condition 2 above implicitly defines an investment demand function relating net investment to q t. If q t > 1, then Φ > 0, which requires I t > δ. Suppose that we have the 3

4 following functional form of the adjustment cost function: Φ = φ 2 2 δ is easy to verify that this satisfies the properties laid out above. Plug this into 2: Now solve for : q t = 1 + φ δ I t = 1 φ q t 1 + δ 6 This says that net investment will be positive if and only if q t 1. φ governs how sensitive investment is to q t. Put differently, a firm s investment as a fraction of its size where size is measured in terms of capital stock should only be a function of q t and parameters. In other words, q t should be a sufficient statistic for investment. 3.2 Tobin s Q, q, and the Hayashi Theorem Recall from above that Tobin s Q is the ratio of the market value of a firm divided by the replacement cost of its capital i.e. V 0 k, the average value of a unit of capital. This is observable you can get the value of the firm from the stock market capitalization i.e. market share price times number of shares and the replacement cost of the firm s capital goods. The theory laid out above, which is explicitly based on optimization, says that investment should depend on q, which is V 0 k marginal value of a unit of capital. This is in general not observable. Or is it? i.e. the Hayashi 1982 laid out conditions under which marginal q and average Q are one in the same. In particular, he showed that i the production function being homogeneous of degree one and ii the total adjustment cost function being homogeneous of degree one i.e. Φ then average and marginal are one in the same. I eschew a formal proof. But intuitively this result can be seen as follows. Under a Cobb- Douglas production technology, the first order condition for the choice of labor, given the capital stock, wage rate, and level of TFP, is: 1 1 αat α n t = kt 7 w t This means that n is proportional to k, holding everything else fixed. Put differently, if the firm has twice as much capital, it will want twice as much labor. From the first order condition for investment: q t = 1 + Φ What this says is that, for a given q t, if you double k, you also want to double I. Hence, if you 4 8

5 give the firm twice as much initial capital, it will double both investment and labor input. Now go the expression for within period profits: Π t = a t f, n t w t n t I t Φ 9 If k doubles, and hence by the arguments above both n and I double, then every term in this doubles. This means that current cash flows are proportional to current k. Intuitively, this means that the value of the firm is therefore proportional to k: V 0 = ϕk 10 Since value is linear in k, then marginal and average are the same thing. This means that the q that should affect investment is the same thing as Tobin s Q. This has important empirical content, as it means that q is observable and the theory can be tested. Unfortunately, as with most theories, this theory can be rejected in the data. The theory suggests that, once measured, q t should be a sufficient statistic for investment. This means that, for example, in regressions of investment on measured q t, the coefficients on anything else should be zero. This is similar to tests of the random walk hypothesis for consumption consumption should be a sufficient statistic for future consumption. People will typically find that things like current cash flow has a significant coefficient when it shouldn t. This is somewhat akin to the excess sensitivity finds in the consumption literature that consumption is too sensitive to current income. 3.3 The Phase Diagram Now let s think about analyzing this in terms of a phase diagram. Let q t be the jump variable the variable on the vertical axis and be the state variable the variable on the horizontal axis. We want to find two isoclines: one were q t+1 q t = 0 and one where +1 = 0. Given the accumulation equation, +1 = 0 = δ, which means that Φ δ = 0 and hence q t = 1. Hence the, +1 = 0 isocline is a horizontal line at q t = 1. q t = 1 11 The q t+1 q t isocline is a little tougher to figure out. Begin my multiplying both sides by 1 + r: Simplify: q t + rq t = E t a t+1 f k +1, n t+1 E t Φ +1 + E t Φ + 1 δq t q t = E t q t+1 = 0 rq t = E t a t+1 f k +1, n t+1 E t Φ +1 + E t Φ δe t q t Now, so as to make the phase diagram in discrete time more natural, we engage in the abuse 5

6 of termingology that we ve used before, and assume that q t q t+1 and the same for n t, I t, and. we can then write the q t+1 q t = 0 isocline as: q t = 1 a t f k, n t Φ r + δ + Φ This is the q t+1 q t isocline. What does it look like q t, space? Let s take the derivative with respect to : dq t = 1 a t f kk, n t + Φ d r + δ kt 2 This of course simplifies to: Φ kt 2 dq t = 1 a t f kk, n t Φ I 2 t d r + δ kt 3 Φ kt 3 Under our assumptions namely that the production function is concave but the adjustment cost function is convex, this derivative must be negative. In other words, the q t+1 q t = 0 isocline slopes down. The steady state occurs where these two cross. Above the +1 locus, q t > 1, and hence capital is growing, so arrows point right. The reverse is true below the +1 = 0 locus, where the arrows point left. To the right of the q t+1 q t = 0 isocline, is too big. This means that the current marginal product of capital is small, which means that q t+1 > q t, so the arrows point up. To the left of the q t+1 q t = 0 locus the arrows point down. We can see that the saddle path must be downward sloping and flatter than the q t+1 q t = 0 locus. The system is saddle point stable. The phase diagram is shown below. 12 6

7 Consider an unexpected, permanent increase in a. This does not affect the +1 = 0 locus, which is still horizontal at q t = 1, but it shifts the q t+1 q t = 0 isocline to the right. The new steady state occurs at the same q, but a higher k. q t must immediately jump up to the new saddle path, and then ride the dynamics into the new steady state. q t jumping means that investment will be abnormally high, which is necessary to get to the new steady state. The phase diagram and impulse responses are shown below: 3.4 What if there are no adjustment costs? From the first order condition above, we see that: q t = 1 + Φ If there are no adjustment costs, then Φ = 0, and hence q t = 1 always. Think about the specific functional form for the adjustment cost given above: no adjustment costs corresponds to the case where φ = 0, which means that net investment is infinitely sensitive to fluctuations in q t, which means that the investment demand curve is perfectly elastic and horizontal at q = 1. In a sense then, investment is residually determined in a model without adjustment costs. With perfectly elastic demand in terms of q t, the quantity of investment in equilibrium is completely determined by saving supply, which comes from the household side of the model and which we haven t yet modeled. 7

8 4 Convex Adjustment Costs: General Equilibrium Now let s consider the role of adjustment costs in general equilibrium. is easiest if we think about this in terms of the household owning the capital stock. The household problem looks very standard, except the fact that it must pay the adjustment cost to change the capital stock. s problem is: max c t,n t,i t,+1,b t+1 E 0 β t uc t + v1 n t t=0 s.t. c t + I t + b t+1 + Φ w t n t + R t r t b t + Π t +1 = I t + 1 δ Basically what this says is that the household can consume, accumulate new capital, accumulate new bonds, and pay adjustment costs associated with adjusting its capital stock with its income, which comes from labor, renting capital, interest income on bonds, and distributed profits. Let s set this up as a current value Lagrangian, with two separate constraints: L = E 0 t=0 β t uc t + v1 n t + λ t w t n t + R t r t b t + Π t c t I t b t+1 Φ µ t I t + 1 δ +1 L = 0 µ t = βe t λ t+1 R t+1 Φ We need to play around with this a little bit. condition for tomorrow s capital stock by λ t : µ t λt+1 = βe t R t+1 Φ λ t λ t +1 L = 0 u c t = λ t 13 c t L = 0 v 1 n t = u c t w t 14 n t L = 0 µ t = λ t 1 + Φ 15 I t + Φ + 1 δµ t L b t+1 = 0 λ t = βe t λ t r t+1 17 Begin by dividing both sides the first order + Φ δ µ t+1 λ t 18

9 Now define q t µt λ t. Think about what this says. µ t is the shadow value of having an extra unit of capital i.e. the units are loosely utils per capital. Dividing this by λ t which is equal to the marginal utility of consumption... i.e. utils per consumption puts this in terms of consumption goods. In other words, q t is the marginal value of capital measured in terms of consumption goods i.e. exactly the same concept as in the partial equilibrium firm problem above. Now simplify the above some: q t = βe t λt+1 λ t R t+1 Φ +1 + Φ +1 Using the first order condition for bonds, this becomes: q t = E t β u c t+1 u R t+1 Φ c t +1 + Φ λ t δq t+1 λ t δq t+1 Note that this is exactly the same as 4 above except that now the interest rate is endogenous and determined by the marginal rate of substitution in consumption. We did all this manipulation so that we could measure the price of capital, q t, in terms of consumption which is observable, at least under the Hayashi theorem as opposed to utils which are not observable. Now simplify some of the other equations using this definition to get: v 1 n t = u c t w t 21 q t = 1 + Φ 22 u c t = βe t u c t r t and 23 are entirely standard, and 22 is identical to the condition from the partial equilibrium problem, 3. The firm problem is standard, where the firms lease the capital from households. The first order conditions are: R t = a t f k, n t 24 w t = a t f n, n t 25 Assume that the adjustment cost function takes the following form: Φ = φ 2 2 δ 26 If we use our normal preference specification, the first order conditions characterizing the equilibrium of the model become: 9

10 θ = 1 w t 27 1 n t c t q t = 1 + φ δ = βe t 1 + r t+1 29 c t c t+1 q t = E t β c t R t+1 φ 2 δ + φ δ + 1 δq t+1 30 c t R t = a t αkt α 1 nt 1 α 31 w t = a t 1 αk α t n α t = I t + 1 δ 33 y t = c t + I t + φ 2 δ 34 2 y t = a t kt α nt 1 α 35 ln a t = ρ ln a t 1 + ε t 36 Below are impulse responses to a technology shock in this model. The parameterization is our standard RBC paramaterization, with three different values of φ: 0, 1.5, and 3. The case of φ = 0 corresponds with the case of the standard RBC model without adjustment costs. 10

13 zero. We can plot each side of 37 against k as follows: Given the assumed Inada type conditions, we can see that the left hand side will cross the right hand side twice once somewhere below k k, and once somewhere above. Call these two points s, S, with s < S. Above or below each of these crossing points, the left hand side of 37 is bigger than the right hand side, so the firm will adjust to k. Within those two bounds, however, the firm prefers in action. We call this an s, S policy because there is a region of inaction but large adjustment beyond the trigger points defining the region of inaction. Suppose that there were no adjustment costs i.e. F = 0. The left hand side would still cross the horizontal axis at k. But with no adjustment costs, we actually know what the slope of the left hand side is. The first order condition of the smooth problem is: 1 + r = V a,k k. Thus, if we evaluate the slope of the left hand side at k = 1 δk, we see that the slope is equal to 1 δ. This means that the straight line and the curve just kiss at this point at every other point the left hand side is above the right hand side. This means without a fixed cost there is a point of inaction if it so happens that the current capital stock will yield the desired capital stock tomorrow, but at every other point there will be adjustment. is straightforward to see how the fixed cost will affect the region of inaction. If F goes up, the straight line shifts up, and the region of inaction gets bigger. 5.2 Kinked Adjustment Costs Here we assume a different kind of non-convexity a non-symmetric price of capital. In particular, assume that the relative price in terms of consumption of accumulating new capital i.e. I = k 1 δk > 0 is 1, but that the relative price of selling capital i.e. I = k 1 δk < 0 is equal to b < 1. We can kind of appeal to this on the basis of adverse selection motivation. You can sell your capital for less than you can buy new capital not because there is any functional difference in the capital both are equally productive, but because the market worries that you 13

15 below for a description of the policy function: These kinked adjustment costs are a kind of irreversibility. The extreme case of pure irreversibility occurs when b = 0. If you can t sell capital for any positive price, the choice to accumulate new capital is effectively irreversible you can t get rid of it for any positive price. This is going to induce cautious behavior on the part of firms they will under-invest when they are below their frictionless optimal level of capital and will also under-adjust when they have too much capital, instead just letting their existing capital depreciate. This cautiousness leads to the region of inaction and lumpiness. 5.3 Reprisal While it is definitely clear that lumpiness is an important feature of the micro data on investment, it is not clear how important it is at an aggregate level. Non-convexities in terms of adjustment costs significantly complicate solving problems once general equilibrium considerations are taken into account there you have to keep track of the capital stock for every firm, which means you quickly run into the curse of dimensionality. There are a number of papers which essentially argue that models based on convex adjustment costs i.e. q theory are sufficient for understanding aggregate investment behavior. This means that ignoring this micro feature is okay from the perspective of understanding aggregate investment see, for example, Thomas 2002 or House To do policy analysis and counterfactuals, however, one needs to know the structural parameters of the model. Even if the convex adjustment costs describe aggregate data well, the parameters of that specification e.g. φ, are reduced form, and policy analysis based on that may be flawed. 15

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