Inventories, Markups and Real Rigidities in Sticky Price Models of the Canadian Economy

Recent New Keynesian models of macroeconomy view nominal cost rigidities, rather than nominal price rigidities, as the key feature that accounts for the observed persistence in output and inflation. Kryvtsov and Midrigan (2010a,b) reassess these conclusions by combining a theory based on nominal rigidities and storable goods with direct evidence on inventories for the U.S. This paper applies Kryvtsov and Midrigan’s model to the case of Canada. The model predicts that if costs of production are sticky and markups do not vary much in response to, say, expansionary monetary policy, firms react by excessively accumulating inventories in anticipation of future cost increases. In contrast, in the Canadian data inventories are fairly constant over the cycle and in response to changes in monetary policy. Similarly to Kryvtsov and Midrigan, we show that markups must decline sufficiently in times of a monetary expansion in order to reduce firms’ incentive to hold inventories and thus bring the model’s inventory predictions in line with the data. The model consistent with salient features of the dynamics of inventories in the Canadian data implies that countercyclical markups account for a sizable (50-80%) fraction of the response of real variables to monetary shocks.Business fluctuations and cycles; Transmission of monetary policy

Inventories and Real Rigidities in New Keynesian Business Cycle Models

Kryvtsov and Midrigan (2008) study the behavior of inventories in an economy with menu costs, fixed ordering costs and the possibility of stock-outs. This paper extends their analysis to a richer setting that is capable of more closely accounting for the dynamics of the US business cycle. We find that the original conclusion survives in this setting: namely, the model requires an elasticity of real marginal cost to output approximately equal to the inverse intertemporal elasticity of substitution in consumption in order to account for the countercyclicality of the aggregate inventory-to-sales ratio in the data.Business fluctuations and cycles; Transmission of monetary policy

Menu costs, multi-product firms, and aggregate fluctautions

I employ a large set of scanner price data collected in retail stores to document that (i) although the average magnitude of price changes is large, a substantial number of price changes are small in absolute value; (ii) the distribution of non-zero price changes has fat tails; and (iii) stores tend to adjust prices of goods in narrow product categories simultaneously. I extend the standard menu costs model to a multi-product setting in which firms face economies of scale in the technology of adjusting prices. The model, because of its ability to replicate this additional set of micro-economic facts, can generate aggregate fluctuations much larger than those in standard menu costs economies. JEL Classification: E31, E3

Inventories, Markups, and Real Rigidities in Menu Cost Models

Real rigidities that limit the responsiveness of real marginal cost to output are a key ingredient of sticky price models necessary to account for the dynamics of output and inflation. We argue here, in the spirit of Bils and Kahn (2000), that the behavior of marginal cost over the cycle is directly related to that of inventories, data on which is readily available.We study a menu cost economy in which firms hold inventories in order to avoid stockouts and to economize on fixed ordering costs. We find that, for low rates of depreciation similar to those in the data, inventories are highly sensitive to changes in the cost of holding and acquiring them over the cycle. This implies that the model requires an elasticity of real marginal cost to output approximately equal to the inverse of the elasticity of intertemporal substitution in order to account for the countercyclical inventory-to-sales ratio in the data. Stronger real rigidities lower the cost of acquiring and holding inventories during booms and counterfactually predict a procyclical inventory-to-sales ratio.Business fluctuations and cycles; Transmission of monetary policy

International Price Dispersion in State-Dependent Pricing Models

Studies of disaggregated international price data document a robust, positive relationship between nominal exchange (NER) volatility and the variability of international relative prices. This relationship is interpreted as evidence that sticky prices rather than trade frictions are the source of the large law of one price deviations across locations. This paper shows that an explicitly micro-founded, menu-cost model predicts a hump-shaped rather than a monotonic relationship between relative price and nominal exchange rate volatility. The hump occurs at higher nominal exchange rate volatilities the less tradeable the goods are. We use this implication of the model to identify the size of the physical barriers that separate nations. Ad valorem trade costs as large as 50 percent are necessary for the model to generate the type of international relative price movements observed in the data.PPP, Law of One Price, menu costs, trade costs

Menu Costs, Multi-Product Firms and Aggregate Fluctuations

I employ a large set of scanner price data collected in retail stores and document that (i) although the average magnitude of price changes is large, a substantial number of price changes are small in absolute value; (ii) the distribution of non-zero price changes has fat tails; and (iii) stores tend to adjust prices of goods in narrow product categories simultaneously. I extend the standard menu costs model to a multi-product setting in which firms face economies of scale in the technology of adjusting prices. The model, because of its ability to replicate this additional set of micro-economic facts, can generate aggregate fluctuations much larger than those in standard menu costs economies.state-dependent pricing, multi-product firms

Sales and the real effects of monetary policy

In the data, a sizable fraction of price changes are temporary price reductions referred to as sales. Existing models include no role for sales. Hence, when confronted with data in which a large fraction of price changes are sales related, the models must either exclude sales from the data or leave them in and implicitly treat sales like any other price change. When sales are included, prices change frequently and standard sticky price models with this high frequency of price changes predict small effects from money shocks. If sales are excluded, prices change much less frequently and a standard sticky price model with this low frequency of price changes predict much larger effects of money shocks. This paper adds a motive for sales in a parsimonious extension of existing sticky price models. We show that the model can account for most of the patterns of sales in the data. Using our model as the data generating process, we evaluate the existing approaches and find that neither well approximates the real effects of money in our economy in which sales are explicitly modeled.Price levels ; Monetary policy

Is Firm Pricing State or Time-Dependent? Evidence from US Manufacturing.

If firm pricing is state, rather than time-dependent, firms are more likely to change prices whenever aggregate and idiosyncratic shocks reinforce each other and trigger desired price changes in the same direction. The distribution of idiosyncratic shocks across adjusting firms therefore varies over time in response to economy-wide disturbances: in times of, say, monetary expansions, the fraction of adjusting firms that have negative idiosyncratic technology shocks should increase. Using measures of technology shocks derived from production function estimates for four-digit US manufacturing industries, we find that sectoral inflation rates are more responsive to negative, as opposed to positive technology disturbances in periods of higher economy-wide inflation, commodity price increases and expansionary monetary policy shocks. We argue, using a quantitative state-dependent sticky price model calibrated to match key features of the US micro-price data, that these results suggest that pricing is state-dependent in US manufacturing.state-dependent pricing, time-dependent pricing, technology shocks

Inventories, lumpy trade, and large devaluations

Fixed transaction costs and delivery lags are important costs of international trade. These costs lead firms to import infrequently and hold substantially larger inventories of imported goods than domestic goods. Using multiple sources of data, we document these facts. We then show that a parsimoniously parameterized model economy with importers facing an (S, s)-type inventory management problem successfully accounts for these features of the data. Moreover, the model can account for import and import price dynamics in the aftermath of large devaluations. In particular, desired inventory adjustment in response to a sudden, large increase in the relative price of imported goods creates a short-term trade implosion, an immediate, temporary drop in the value and number of distinct varieties imported, as well as a slow increase in the retail price of imported goods. Our study of six current account reversals following large devaluation episodes in the last decade provide strong support for the model's predictions.

Temporary price changes and the real effects of monetary policy

In the data, prices change both temporarily and permanently. Standard Calvo models focus on permanent price changes and take one of two shortcuts when confronted with the data: drop temporary changes from the data or leave them in and treat them as permanent. We provide a menu cost model that includes motives for both types of price changes. Since this model accounts for the main regularities of price changes, its predictions for the real effects of monetary policy shocks are useful benchmarks against which to judge existing shortcuts. We find that neither shortcut comes close to these benchmarks. For monetary policy analysis, researchers should use a menu cost model like ours or at least a third, theory-based shortcut: set the Calvo model's parameters so that it generates the same real effects from monetary shocks as does the bench-mark menu cost model. Following either suggestion will improve monetary policy analysis.Keynesian economics ; Prices