Sticky-Price Theory (Menu Cost Theory) of SRAS
What is Sticky-Price Theory (Menu Cost Theory) of SRAS?
The sticky-price (menu cost) theory says SRAS slopes upward because some firms keep prices fixed despite menu costs, so rising overall prices boost their sales and output.
Changing posted prices is costly (reprinting menus/catalogs, updating systems, annoying customers), so many firms hold prices steady in the short run. When the general price level rises, firms with sticky prices become relatively cheaper, their sales rise, and they increase output. As menu costs are eventually paid and all prices adjust, this output boost disappears, returning the economy to potential output. It is one of the three textbook explanations for an upward-sloping SRAS curve.
Sticky-Price Theory (Menu Cost Theory) of SRAS: a worked example
A pizzeria posts $16 a pizza, pays $7 in ingredients and packaging, and sells 60 a day, so daily contribution is 60 × $9 = $540. The general price level then rises 8 percent: rival shops move to $17.28 and her own ingredient bill climbs to $7.56. Reprinting menus, replacing the outdoor board, and reprogramming the ordering system would cost $450 in one go, so she leaves the price at $16. Now visibly the cheap option, she sells 69 pizzas a day and adds an evening shift to keep up. Output rose because her price did not, even though contribution per pizza thinned from $9.00 to $8.44. Add together every firm behaving this way and real output rises with the price level, which is the upward slope of SRAS. Once she pays the $450 and posts $17.28, the discount is gone, sales drift back toward 60, and the extra output disappears.
The mistake students make with sticky-price theory (menu cost theory) of sras
Students hand the menu cost the wrong job. Some write that the pizzeria produces more because it avoided the reprinting expense; others treat that expense as a production cost and shift SRAS left with it. Neither works. Reprinting is a one-time outlay that explains only why the posted price stayed at $16, and a one-time outlay is not a cost per pizza. The extra output comes entirely from the relative price, which fell when every rival moved up and this shop did not. State the two halves separately and the answer holds together.
Sticky-Price Theory (Menu Cost Theory) of SRAS questions
What is a menu cost in economics?
Menu costs are the real resources a firm spends to change a posted price: reprinting menus and catalogs, relabeling shelves, reprogramming registers and websites, retraining staff, and absorbing customer irritation. Because those costs get paid whether the price moves a lot or a little, many firms wait and adjust in occasional jumps rather than continuously. All that waiting, summed across firms, is what makes the overall price level slow to adjust in the short run.
Why do sticky prices make short-run aggregate supply slope upward?
Firms that hold their prices fixed become relatively cheaper when the general price level rises, so buyers shift toward them and those firms increase production. A higher price level therefore arrives together with higher real output, tracing an upward-sloping curve. The effect is temporary. Once enough firms pay their menu costs and reset prices, relative prices return to normal, sales fall back, and the economy returns to potential output.
Does every firm have to keep its price fixed for the theory to work?
Only some firms need sticky prices. Those that reset quickly move with the price level and gain no advantage, while the ones still posting old prices look cheap, take the extra sales, and raise output. The larger the share of firms holding still, the bigger the output response to a given price-level change and the flatter SRAS is drawn. An economy where every firm repriced instantly would have a vertical short-run curve.
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