Understanding AS and AD: Long Run and Short Run

Welcome to our exploration of aggregate supply and demand, the fundamental building blocks of macroeconomics.Let's start by understanding what aggregate demand means in macroeconomics.Aggregate demand represents the total spending on all goods and services in an economy at different price levels.Aggregate demand consists of four main components: consumer spending, business investment, government spending, and net exports.Now, let's understand aggregate supply, which represents the total quantity of goods and services firms are willing to produce.Aggregate supply is influenced by several key factors including resource availability, technology, production costs, and business taxes.When aggregate supply and aggregate demand intersect, we find the equilibrium point. This represents the price level and real GDP where the economy is in balance.If the price level is too low, demand exceeds supply, pushing prices up. If the price level is too high, supply exceeds demand, pushing prices down.In the short run, the aggregate supply curve slopes upward due to sticky wages and prices.Wages and prices are sticky because they adjust slowly due to contracts, menu costs, and other institutional factors.When we add aggregate demand, we find our initial equilibrium point where the curves intersect.A negative supply shock, like an oil price spike, shifts the SRAS curve left, leading to higher prices and lower output.A negative demand shock, such as decreased consumer spending, shifts the AD curve left, causing both prices and output to fall.These short-run fluctuations cause temporary changes in output, employment, and the price level as the economy adjusts to shocks.In the long run, the aggregate supply curve becomes vertical at the economy's potential GDP level.This vertical long-run aggregate supply curve represents the level of output the economy can sustain when all resources are fully employed.The short-run aggregate supply curve is upward sloping, and aggregate demand determines where the economy operates in the short run.When the economy operates away from its potential GDP, a natural adjustment process begins through the price mechanism.Eventually, the economy reaches its long-run equilibrium at potential GDP, where the SRAS, LRAS, and AD curves all intersect.This self-adjustment process ensures that, in the long run, the economy returns to its potential output level, though the price level may be different.The long-run equilibrium represents a stable state where all markets have fully adjusted.