Sticky-Wage Theory of SRAS vs Misperceptions Theory of SRAS
Sticky-Wage Theory of SRAS and Misperceptions Theory of SRAS are two Aggregate Demand & Supply concepts in AP Economics that students often mix up. Sticky-Wage Theory of SRAS is the sticky-wage theory says SRAS slopes upward because nominal wages adjust slowly, so a higher price level raises firm profits and output in the short run. Misperceptions Theory of SRAS is the misperceptions theory says SRAS slopes upward because producers temporarily mistake a rise in the overall price level for a rise in their own relative price and produce more. Here is how they compare side by side.
Because many wages are fixed by contracts or norms, they do not change immediately when the price level rises. When output prices increase but wages stay put, real labor costs fall and profit margins widen, so firms hire more and expand production. This effect is temporary: once wage contracts are renegotiated to reflect higher prices, real wages and output return to the long-run level, which is why LRAS is vertical. It is one of three standard explanations (along with sticky-price/menu-cost and misperceptions) for the upward-sloping SRAS.
When the aggregate price level rises unexpectedly, individual producers may believe the price of their own good has risen relative to others, signaling higher profitability, so they increase output and hiring. Once they realize the increase was economy-wide and their relative price is unchanged, they cut output back to normal. This temporary confusion makes output respond positively to surprise price-level changes in the short run but not the long run. It is the third standard explanation for the upward-sloping SRAS alongside sticky-wage and sticky-price theories.
Sticky Wages vs Misperceptions: Two Accounts of an Upward Sloping SRAS
| Sticky-Wage Theory | Misperceptions Theory | |
|---|---|---|
| What is holding output back | Nominal wages fixed by contracts and slow to renegotiate | Nothing is fixed; producers misread which price has risen |
| Why output rises when prices rise | Output prices climb while the wage bill does not, so profit per unit widens and firms produce more | A producer takes a general price rise for a rise in the relative price of their own good and produces more |
| Who is constrained or fooled | Firms and workers bound by an agreed wage | Producers reading their own selling price without knowing the economy-wide picture |
| What the real wage does | Falls, since prices rose and the nominal wage did not | Plays no part; the theory turns on relative prices, not wages |
| What ends the short run | Contracts expire and nominal wages catch up with prices | Producers learn that the general price level rose and cut output back |
| Evidence it points to | Multi-year labor agreements and infrequent wage reviews | Incomplete information about prices outside a producer's own market |
Sticky wages work through profit margins, and the arithmetic is small enough to check
Take an illustrative firm whose worker produces 10 units an hour and is paid 20 dollars an hour under an agreement signed before the period began. At the starting price level the good sells for 2.50 dollars, so an hour of labor brings in 25 dollars of revenue against a 20 dollar wage, leaving 5 dollars to cover other costs and profit. Now let the price level rise by 10 percent, carrying the good to 2.75 dollars. Revenue per hour becomes 27.50 dollars while the wage is still 20 dollars, so the margin widens from 5 dollars to 7.50 dollars. Nothing about the technology changed and no worker became more skilled, yet producing another unit is more attractive than it was, so the firm runs longer shifts and hires. Do that across thousands of firms and total output rises with the price level, which is the upward slope of SRAS. The mechanism has an expiration date built in. When the agreement is renegotiated, workers press for a wage that restores their purchasing power, the margin returns to where it started, and the extra output disappears. Sticky prices, the third standard explanation at /glossary/sticky-price-theory-menu-cost-theory-of-sras, reach the same slope through firms that leave posted prices alone.
Misperceptions need no contract, only incomplete information
The second theory drops rigidity altogether. A grain farmer sees the price of grain rise by 8 percent and has to decide what that signals. If grain alone has become more valuable, expanding acreage is the right move. If every price in the economy rose by 8 percent, then nothing has changed in relative terms and expanding is a mistake. Prices for a farmer's own product arrive immediately, while news about the general price level arrives late and in fragments, so some producers guess wrong and expand. Aggregated across an economy, those wrong guesses mean a higher price level comes with higher output, which again gives an upward sloping short-run curve. What matters here is the difference between the price level people expected and the price level they got. A fully anticipated rise fools nobody and produces no extra output. All three explanations agree about the long run. Once contracts reset, or once producers see the whole price list, output returns to the level that resources and technology allow, which is why long-run aggregate supply is vertical at /glossary/long-run-aggregate-supply. Only supply-side changes move that line, and no amount of price level movement will.
Frequently asked questions
What is the sticky-wage theory of SRAS?
The sticky-wage theory says short-run aggregate supply slopes upward because nominal wages are locked in by agreements while output prices are free to move, so a higher price level widens profit margins and firms produce more. Once contracts are renegotiated, wages catch up and the extra output vanishes. That is why the effect lasts only through the short run.
How is the misperceptions theory different from sticky wages?
The misperceptions theory needs no fixed wage or price at all, because it explains the upward slope through producers mistaking a general price rise for a rise in their own relative price. Sticky wages make output profitable to expand, while misperceptions make output look profitable to expand. One is about contracts and the other is about information.
Do these theories change the shape of long-run aggregate supply?
No, all three explanations of the SRAS slope leave long-run aggregate supply vertical at full-employment output, because each mechanism relies on something temporary. Contracts expire, posted prices are eventually revised, and producers eventually learn what the general price level did. Only changes in resources, technology or institutions move the long-run curve.
Live AD/AS Model graph. Drag the curves, or open the full version.
Get AP Econ exam tips in your inbox
Occasional emails with study tips, new interactive graphs, and exam-season reminders. Free, no spam.
No spam. Unsubscribe anytime. Read our privacy policy.
Keep track of what you have studied
A free EconLearn account adds progress tracking, your quiz history, and achievements. Studying here is free either way, and there is nothing to pay for as a student.
Create a free accountAlready have one? Sign in
Last updated