Chapter 149 - Sticky Prices, Sticky Wages: The Microeconomic Foundations of Macroeconomic Problems

Sticky Prices, Sticky Wages: The Microeconomic Foundations of Macroeconomic Problems

In the aftermath of the Great Depression and continuing through contemporary economic crises, economists have grappled with a fundamental puzzle: why do market economies frequently deviate from equilibrium, experiencing prolonged periods of unemployment and output below potential? The answer lies not in failures of aggregate reasoning but in the microeconomic behavior of individual firms and workers whose pricing and wage-setting decisions create nominal rigidities that reverberate throughout the entire economy. Understanding how sticky prices and sticky wages form the microeconomic foundations of macroeconomic dysfunction represents one of the most important insights in modern economics, bridging the divide between individual rational behavior and aggregate market failures.^[1][2]

The Nature and Extent of Nominal Rigidities

Nominal rigidities—the phenomenon whereby prices and wages adjust slowly to changing economic conditions—stand in stark contrast to the frictionless world envisioned by classical economics. In a perfectly flexible economy, prices and wages would immediately adjust to clear markets, ensuring continuous full employment equilibrium. Yet empirical evidence consistently demonstrates that this theoretical ideal diverges sharply from reality.^[3][1]

Price stickiness manifests in several dimensions. Microeconomic studies reveal that individual prices change relatively infrequently, with the median frequency approximately once per year across most developed economies, though the United States exhibits somewhat greater flexibility with prices changing roughly twice annually. This apparent flexibility masks deeper rigidity: approximately 75% of the time during any given year, firms charge exactly the same nominal price, suggesting that prices tend to revert to established reference points. The pattern is particularly striking when temporary sales promotions are separated from regular price changes—the underlying "reference prices" display substantially greater stickiness, changing on average only once every 12-14 months.^[4][5][6]

Wage rigidity exhibits even more pronounced persistence. Wages display strong asymmetry, proving far stickier downward than upward—a phenomenon economists term "downward nominal wage rigidity". During economic downturns, nominal wages rarely fall despite widespread unemployment and excess labor supply. Instead, firms respond to decreased demand by reducing employment rather than cutting wages, a pattern evident across numerous recessions including the Great Depression. Empirical estimates suggest that wage contracts persist substantially longer than price contracts, with average durations ranging from 11 to 20 months depending on country and institutional context.^{[7][8][9][10][11][3]}

This asymmetry between wage and price adjustment creates particularly acute problems. When aggregate demand declines, prices may fall (though slowly), but wages remain sticky, causing real wages to rise. This increase in labor costs relative to output prices squeezes profit margins, inducing firms to reduce employment, thereby transforming a demand shock into persistent unemployment.^[9][12]

Microeconomic Sources of Price Stickiness

The theoretical literature has identified multiple microeconomic mechanisms that generate price rigidity, each grounded in rational firm behavior given market frictions and strategic considerations.

Menu costs represent perhaps the most straightforward explanation for price stickiness. Originally introduced by Sheshinski and Weiss in 1977, menu cost theory recognizes that changing prices imposes real costs on firms: reprinting catalogs and menus, reprogramming point-of-sale systems, communicating changes to customers, and risking customer confusion or dissatisfaction. The classic restaurant menu provides the metaphor, but costs extend far beyond physical printing. Even when these costs are small in absolute terms, they can be sufficient to prevent price adjustments when the benefits of changing prices are also small.^[2][13]

The menu cost framework becomes particularly powerful when embedded in general equilibrium models. Research demonstrates that even modest menu costs can generate substantial macroeconomic effects when combined with monopolistic competition and strategic complementarities in pricing. Firms facing menu costs will not adjust prices continuously but rather will allow prices to drift away from optimal levels until the cumulative benefit of adjustment justifies incurring the fixed cost. This state-dependent pricing creates "selection effects" whereby firms adjust prices precisely when doing so matters most for their profits, potentially attenuating aggregate price stickiness.^[14][15][16]

However, recent empirical work challenges menu costs as the complete explanation. Nakamura and Steinsson's influential research using multisector models demonstrates that incorporating heterogeneity in price stickiness across sectors triples the degree of monetary non-neutrality compared to single-sector models. Moreover, when temporary price changes (sales) are distinguished from regular price adjustments, the resulting model implies that aggregate price stickiness is considerably greater than the frequency of microeconomic price changes would suggest. This finding reconciles the observation of frequent price changes at the micro level with substantial monetary non-neutrality at the macro level.^[16][6][17]

Strategic complementarities amplify the effects of menu costs and other sources of rigidity. When a firm's optimal price depends positively on other firms' prices—a natural consequence of imperfect substitutability between goods—each firm has limited incentive to adjust its price if it expects others to maintain their prices. This coordination problem can transform individually small rigidities into large aggregate effects. Ball and Romer's seminal work showed that nominal price rigidity can arise as a coordination failure: if a firm's desired price increases in others' prices, then even small costs of adjustment can sustain an equilibrium where all firms maintain rigid prices.^[18]

Monopolistic competition provides the market structure foundation for modern sticky price models. The Dixit-Stiglitz framework, which has become ubiquitous in macroeconomics, posits that each firm produces a differentiated variety and faces a downward-sloping demand curve. This market power allows firms to set prices rather than taking them as given, creating the precondition for meaningful price-setting frictions. The constant elasticity of substitution (CES) utility function typically employed generates a constant markup over marginal cost in flexible-price equilibrium, simplifying analysis while capturing essential features of imperfect competition.^[19][20][21]

Recent extensions incorporating oligopolistic market structures rather than monopolistic competition have shown that strategic interactions between firms can substantially amplify monetary non-neutrality. Mongey's research demonstrates that an oligopoly economy with the same frequency of micro-level price adjustment generates output responses to monetary shocks more than twice as large as an economy with monopolistically competitive sectors. The intuition is that strategic interactions create additional real rigidities that complement nominal rigidities, flattening the Phillips curve and magnifying real effects of nominal shocks.^[15]

Microeconomic Sources of Wage Stickiness

Wage rigidity emerges from distinct microeconomic mechanisms rooted in labor market institutions, information frictions, and the unique nature of employment relationships.

Implicit contracts and efficiency wages provide powerful explanations for wage rigidity even in non-unionized settings. Implicit contract theory, developed by Azariadis, Baily, and others, recognizes that employers and employees engage in long-term relationships characterized by mutual expectations and informal understandings. Workers are typically more risk-averse than firms, which have access to capital markets and diversification. This creates scope for implicit insurance contracts whereby firms stabilize wages in exchange for workers accepting employment risk.^[22][23][24]

Efficiency wage theory offers a complementary explanation: firms may rationally pay wages above market-clearing levels to motivate workers, reduce turnover, attract higher-quality applicants, or maintain worker morale. When effort is costly to monitor and workers can adjust their intensity, paying wages above the market rate creates a penalty for shirking (potential job loss with a return to lower outside wages) that induces greater effort. Importantly, cutting wages during downturns would undermine this incentive mechanism and potentially violate implicit promises, reducing productivity more than proportionately to wage savings.^{[25][26][27][22]}

This logic helps explain the strong downward rigidity of nominal wages. Bewley's extensive interview research with managers revealed that firms resist wage cuts primarily because they fear damaging worker morale and violating norms of fairness, which would reduce productivity and increase turnover. The evidence suggests that workers evaluate wage changes not just in absolute terms but relative to reference points and expectations, making wage cuts particularly costly to implement.^[28][3][7]

Long-term contracts and staggered wage setting introduce temporal rigidity into labor markets. Many workers, particularly in unionized sectors and larger firms, operate under contracts that fix wages for extended periods—often one to three years. Even beyond formal union contracts, implicit understandings and established practices create persistence in wage patterns. Taylor's influential 1979 model of staggered wage contracts demonstrated how overlapping contracts with different expiration dates create wage persistence that extends beyond individual contract durations. If each cohort of workers sets wages based partly on wages prevailing for other workers, and these wages were themselves set in previous periods, aggregate wages inherit substantial inertia.^[29][3][25]

The Calvo pricing framework, which has become standard in New Keynesian models, applies this insight in a particularly tractable form: each period, a fixed fraction of firms (or workers) can reset their wage, with adjustment opportunities arriving randomly. While somewhat unrealistic in its details, this formulation captures essential features of staggered adjustment and permits analytical tractability in dynamic general equilibrium models.^[30][31][32]

Insider-outsider theory illuminates how labor market segmentation perpetuates wage rigidity and unemployment. Lindbeck and Snower's framework emphasizes that incumbent workers ("insiders") possess advantages over unemployed workers ("outsiders") stemming from labor turnover costs: hiring costs, firing costs, and firm-specific human capital. These costs give insiders bargaining power, which they use to negotiate wages above market-clearing levels without fear that outsiders will underbid them. The outsiders, despite their willingness to work for lower wages, cannot credibly commit to maintaining these lower wages once hired, as they would then become insiders with similar bargaining power.^[33][34][35]

This theory helps explain persistent unemployment and hysteresis effects, whereby temporary shocks have permanent effects on the natural rate of unemployment. When a negative shock reduces employment, the pool of insiders shrinks. Subsequently, remaining insiders negotiate high wages appropriate for their smaller numbers, preventing unemployed outsiders from regaining employment even after the initial shock dissipates. Blanchard and Summers demonstrated that this mechanism can account for the persistence of European unemployment following the oil shocks of the 1970s.^[36][37]

From Micro Rigidities to Macro Dysfunction

The critical insight linking microeconomic rigidities to macroeconomic dysfunction is that nominal price and wage stickiness prevents monetary neutrality and creates a role for aggregate demand in determining real economic outcomes. This overturns the classical dichotomy whereby nominal variables (like the money supply) affect only nominal variables (like the price level), leaving real variables (output, employment) unaffected.^[38][1]

The New Keynesian Phillips Curve formalizes the relationship between inflation and real economic activity in the presence of sticky prices. Derived from micro-founded models with Calvo pricing, the curve relates current inflation to expected future inflation and current marginal cost (or output gap). Unlike the traditional Phillips curve, which suggested a stable exploitable tradeoff between inflation and unemployment, the New Keynesian version emphasizes forward-looking expectations and implies that only unexpected deviations from expected inflation or marginal cost changes affect the inflation rate.^{[39][40][32][41]}

The key mechanism operates through firms' price-setting behavior. When only a fraction of firms can adjust prices each period, those firms setting prices must forecast future cost and demand conditions over the expected life of the price. If aggregate demand increases, raising marginal costs and output above potential, forward-looking firms increase prices, generating inflation. However, the large fraction of firms unable to adjust prices means the aggregate price level responds sluggishly, allowing the real effects of demand shocks to persist.^[30][39]

Importantly, the slope of this Phillips curve—how much inflation responds to a given output gap—depends critically on the frequency and synchronization of price changes. Greater price flexibility steepens the Phillips curve, implying smaller real effects of demand shocks but larger inflation responses. Heterogeneity in price stickiness across sectors can flatten the Phillips curve relative to a homogeneous economy, amplifying real effects. Recent evidence suggests that the distribution of price stickiness matters substantially, with a multisector model calibrated to match micro price data implying considerably larger monetary non-neutrality than single-sector models.^[42][43][16]

Coordination failures and aggregate demand externalities represent another channel through which micro rigidities generate macro dysfunction. When demand complementarities create strategic complementarities in production decisions, and nominal rigidities prevent price adjustment, the economy becomes vulnerable to coordination failures whereby all firms simultaneously reduce production in response to pessimistic expectations, creating self-fulfilling recessions.^[44][45]

The logic operates as follows: if a firm expects other firms to reduce production and employment, it anticipates reduced demand for its own products (since workers at other firms have lower income). This expectation justifies reducing its own production, which in turn validates other firms' pessimistic expectations. With flexible prices, this coordination failure would be resolved through price adjustment. But sticky prices and wages prevent this mechanism, potentially trapping the economy in an inefficient equilibrium with high unemployment.^[45][1][18]

Diamond, Mortensen, and Pissarides's search and matching framework provides a complementary perspective on coordination failures in labor markets. Search frictions—the time-consuming process of workers finding suitable jobs and firms finding suitable workers—create a thick-market externality whereby the efficiency of matching depends on the number of firms posting vacancies and workers searching for employment. When a negative demand shock reduces hiring, it worsens the job-finding rate for unemployed workers, which can discourage search effort and further reduce matching efficiency, creating amplification and persistence in unemployment.^[46][47]

Real rigidities and the transmission of nominal shocks highlights that price and wage stickiness alone may be insufficient to generate large macroeconomic effects; complementary "real rigidities" that make firms' desired relative prices insensitive to aggregate conditions substantially amplify the impact of nominal rigidities. Blanchard and Galí demonstrated that real wage rigidity—whereby the real wage adjusts sluggishly to shocks—significantly affects equilibrium employment and output fluctuations.^[48][49]

The interaction between nominal and real rigidities creates powerful amplification: when real rigidities make firms reluctant to change relative prices, small nominal rigidities can generate large departures from flexible-price equilibrium. Ball and Romer showed that in the presence of real rigidities, even tiny menu costs can rationalize substantial nominal price stickiness. This resolves a potential puzzle: if menu costs are small, why don't firms simply incur them to adjust prices? The answer is that when real rigidities are present, the private benefit to individual price adjustment is much smaller than the social benefit, so small menu costs suffice to prevent adjustment despite significant aggregate consequences.^[50][18]

Historical Evidence: The Great Depression as Laboratory

The Great Depression provides a stark historical illustration of how wage and price rigidities can transform a demand shock into prolonged economic catastrophe. Between 1929 and 1933, U.S. nominal GDP fell by approximately 30%, yet nominal wages declined by only 5% while real wages actually rose by 11% as prices fell more than wages. This divergence between real wages and labor productivity helps explain why unemployment reached 25% at the trough.^[10][51][9]

Recent research using granular micro data has illuminated the extent and nature of wage rigidity during this period. Lennard's study of UK wage data found that while nominal wages did change during the Depression, they changed far less frequently than economic conditions warranted, and wage cuts were concentrated in years of most severe distress (1931 saw more than one-third of workers receiving wage cuts). President Hoover's explicit efforts to persuade business leaders to maintain high wages, motivated by the contemporary belief that wage maintenance would preserve purchasing power, likely exacerbated the Depression by preventing wage adjustment.^[12][9][10]

The contrasting experience during and after World War II proves instructive. During the war, essentially unlimited labor demand provided employment even to the long-term unemployed who had been scarred by Depression-era joblessness, reversing hysteresis effects and restoring labor market conditions resembling the pre-Depression era. This natural experiment suggests that sufficiently large demand interventions can overcome the persistence created by wage rigidities and insider-outsider dynamics.^[52]

Contemporary Policy Implications

Understanding the microeconomic foundations of macroeconomic dysfunction carries profound implications for policy design. If sticky prices and wages create monetary non-neutrality, monetary policy becomes a powerful tool for demand management—but one that must be wielded carefully given the expectations channel.

The Lucas Critique and rational expectations revolutionized thinking about policy by emphasizing that the econometric relationships observed under one policy regime will change when policy changes, as forward-looking agents adjust their expectations. Applied to wage and price setting, this implies that announcements of future policy changes can affect current inflation through their impact on expectations, even before the policy is implemented. A credible central bank commitment to low inflation can reduce inflation expectations, allowing disinflation with smaller output costs.^[53][54][55]

Anchoring inflation expectations has emerged as a central objective of modern central banking. When inflation expectations are firmly anchored around the central bank's target, temporary deviations of actual inflation from target are understood as transitory, preventing them from affecting wage and price-setting behavior and becoming entrenched. Trust in the central bank plays a crucial role: research using Dutch household survey data finds that higher trust in the ECB lowers inflation expectations on average, reduces uncertainty about future inflation, and creates anchoring whereby expectations above (below) target are moderated downward (upward).^[56][57]

The practical importance of anchoring became evident during the 2008 financial crisis and its aftermath. In countries where central bank credibility successfully anchored expectations, even unprecedented monetary expansions did not generate runaway inflation. Conversely, the recent inflation surge following pandemic-era fiscal expansions has raised questions about whether expectations have become de-anchored, potentially requiring more aggressive monetary tightening to restore price stability.^[57]

Optimal monetary policy in the presence of sticky prices and wages involves balancing multiple objectives. The New Keynesian framework suggests that policy should minimize a weighted sum of inflation variance and output gap variance. The famous Taylor Rule—whereby the central bank sets interest rates in response to deviations of inflation from target and output from potential—emerges as approximately optimal in simple models.^{[58][59][60][61]}

However, important complications arise. First, the appropriate measure of the "output gap" is the gap between actual and efficient output, not actual and trend output. When efficiency wage considerations or other labor market imperfections exist, efficient output may deviate substantially from potential output. Second, the presence of wage rigidity as well as price rigidity affects optimal policy: Chugh demonstrates that sticky wages alone make price stability optimal in response to government spending shocks, similar to sticky prices alone.^{[59][60][58][50]}

Third, downward nominal wage rigidity creates a strong argument for maintaining positive inflation targets. When nominal wages cannot fall, real wage adjustment in response to shocks must occur through inflation eroding real wages. In a zero-inflation environment, this adjustment mechanism is unavailable, potentially requiring much larger employment fluctuations to clear labor markets. Schmitt-Grohé and Uribe show that downward nominal wage rigidities create a long-run tradeoff between inflation and unemployment, reviving some aspects of the traditional Phillips curve in environments with binding downward wage constraints.^[8][62][63]

Hysteresis and the costs of recessions represents a particularly troubling implication of wage rigidities combined with insider-outsider dynamics and search frictions. When recessions produce long-term unemployment, affected workers may suffer persistent scarring: skill deterioration, stigma from unemployment spells, and loss of insider status. These effects can raise the natural rate of unemployment, making recession-induced unemployment partially permanent.^{[64][65][36][52]}

Blanchard's research on European unemployment demonstrates that hysteresis can be empirically important, with unemployment persistence following the 1970s oil shocks contributing to permanently higher European unemployment rates. More recent evidence using OECD estimates of natural unemployment rates finds that shocks to actual unemployment can shift natural rate estimates, suggesting hysteresis remains relevant. This implies that preventing deep recessions carries benefits beyond short-run stabilization, potentially avoiding permanent damage to labor market functioning.^{[65][46][36][52]}

Sectoral Heterogeneity and Aggregate Implications

A crucial recent development recognizes that the distribution of price stickiness across sectors significantly affects aggregate dynamics. Carvalho and Schwartzman demonstrate that heterogeneity in price adjustment frequencies leads monetary shocks to have substantially larger real effects than in one-sector economies with the same average frequency of adjustment. The intuition is that sticky-price sectors act as "anchors" that limit the response of flexible-price sectors, since strategic complementarities imply each sector's optimal price depends on the aggregate price level, which moves sluggishly due to sticky sectors.^[66]

Pasten, Schoenle, and Weber extend this insight, showing that sectoral heterogeneity in nominal price rigidity can alter which sectors matter most for aggregate fluctuations. Surprisingly, shocks to the largest or most central sectors may not dominate aggregate dynamics when heterogeneous pricing frictions are considered, as the most price-flexible sectors may absorb shocks through price adjustment while sticky-price sectors transmit shocks to output.^[43]

The inflationary episode following the COVID-19 pandemic illustrated these mechanisms vividly. The combination of sectoral demand reallocation (from services to goods), supply chain disruptions affecting specific sectors, and heterogeneous price stickiness across industries generated substantial inflation with pronounced sectoral variation. Sectors with more flexible prices exhibited larger price increases, while input-output linkages transmitted shocks across sectors, demonstrating how sectoral heterogeneity shapes aggregate outcomes.^[67]

Reconciling Micro Flexibility with Macro Rigidity

A potential puzzle emerges from the observation that individual prices change relatively frequently—roughly every four to six months on average—yet aggregate prices respond sluggishly to monetary shocks, as if characterized by much greater stickiness. Kehoe and Midrigan resolve this paradox by distinguishing temporary price changes from regular price changes. Temporary changes (sales and promotions) are frequent and large but return the price to its previous level, displaying no low-frequency trend. Regular prices, in contrast, change infrequently (averaging 12-14 months between changes) but exhibit persistent trends.^[6][17]

This distinction matters crucially for monetary transmission. Temporary price changes cannot effectively offset monetary shocks because they are short-lived and self-reversing. Regular prices, being much stickier, dominate the response to persistent monetary disturbances. As a result, an economy with frequent temporary price changes but infrequent regular price changes behaves, from a monetary policy perspective, much like an economy with uniformly sticky prices, even though the micro data shows frequent adjustment.^[17][6]

Conclusion

The microeconomic foundations of macroeconomic dysfunction rest firmly on the twin pillars of sticky prices and sticky wages. What appears at first glance as irrational—firms failing to adjust prices, workers resisting wage cuts despite unemployment—emerges upon closer examination as individually rational behavior given menu costs, strategic complementarities, efficiency wage considerations, implicit contracts, and labor market institutions. Yet these micro-level rigidities, when aggregated across markets, generate profound macroeconomic consequences: monetary non-neutrality, persistent unemployment, coordination failures, and the potential for self-fulfilling recessions.

The intellectual journey from individual price-setting decisions to aggregate business cycles exemplifies the power and necessity of microfoundations in macroeconomics. By grounding aggregate phenomena in explicit models of individual optimization and market interaction, modern macroeconomics has achieved a synthesis that reconciles Keynesian insights about aggregate demand with the discipline of rational expectations and optimization. This synthesis reveals that market failures at the macro level need not imply irrationality at the micro level; rather, they emerge from the interaction of individually sensible frictions.

For policy, these insights carry critical implications. Monetary policy possesses real effects precisely because nominal rigidities prevent immediate price adjustment, creating a channel through which demand management can stabilize output and employment. Yet effective policy requires credibility to anchor expectations, preventing rigidities from translating temporary shocks into persistent inflation or deflation. The optimal policy framework must account for both price and wage stickiness, recognize the role of real rigidities in amplifying nominal frictions, and acknowledge that the distribution of adjustment speeds across sectors shapes aggregate dynamics in subtle but important ways.

Perhaps most fundamentally, understanding the microeconomic foundations of macroeconomic problems underscores that recession and unemployment are not inevitable features of market economies but rather failures of coordination and adjustment that appropriate policies can address. By tracing macro dysfunction to its micro origins—the restaurant reluctant to reprint menus, the firm unwilling to cut wages for fear of damaging morale, the worker unable to credibly commit to low wages—economics illuminates both the sources of our economic difficulties and the pathways toward their resolution.

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Chapter 149 - Sticky Prices, Sticky Wages: The Microeconomic Foundations of Macroeconomic Problems

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