Summary
Highlights
The video introduces aggregate supply and its role in macro equilibrium. It highlights the complexity and differing interpretations between Keynesian and Classical economists, emphasizing that neither view is entirely right or wrong, and understanding their differences is crucial.
In the classical model, SRAS is upward sloping. Its position is determined by economy-wide costs of production. Increases in costs (e.g., wages, raw materials, oil prices, business taxes, import prices due to a weak exchange rate) shift SRAS left, while decreases shift it right. These shifts are considered 'supply-side shocks' due to their rapid impact.
The classical LRAS is vertical, representing the full employment level of output (YFE), which is the maximum sustainable output. This occurs when the economy is at its natural rate of unemployment. LRAS shifts right due to increases in the quantity or quality of factors of production (Q squared of cell: capital, enterprise, land, labor) or an improvement in productive efficiency (fall in long-run costs of production).
Specific examples of factors that shift LRAS right include improved labor productivity, increased investment in capital goods (technology, R&D, new factories/machinery), infrastructure improvements (transport, utilities), increases in the quantity of labor (e.g., immigration), increased competition, and new resource discoveries.
LRAS can shift left due to decreased labor productivity, mass capital depreciation, war/conflict/natural disasters, epidemics (reducing labor quantity/productivity), hysteresis (long-term unemployment leading to reduced labor force), and emigration.
Keynesian economists agree on the factors that shift the potential output (LRAS shifts), but they dispute the shape of the aggregate supply curve and the idea of separate short-run and long-run curves. They believe the aggregate supply curve is bendy, reflecting the level of spare capacity. In a deep recession, output can increase without inflation due to unemployed factors of production. As the economy approaches full employment, resource scarcity leads to rising costs and inflation, eventually making the curve vertical. Crucially, Keynesians believe the economy can be in long-run equilibrium below YFE.
The video concludes by summarizing the detailed coverage of aggregate supply and looks forward to the next video, which will combine aggregate demand and aggregate supply to discuss macro equilibrium.