Explain why the following statements are false. a. "The...

Explain why the following statements are false. a. "The aggregate-demand curve slopes downward because it is the horizontal sum of the demand curves for individual goods." b. "The long-run aggregate-supply curve is vertical because economic forces do not affect long-run aggregate supply." c. "If firms adjusted their prices every day, then the short-run aggregate-supply curve would be horizontal." d. "Whenever the economy enters a recession, its long-run aggregate-supply curve shifts to the left."

Explain why the following statements are false.
a. "The aggregate-demand curve slopes downward because it is the horizontal sum of the demand
curves for individual goods."
b. "The long-run aggregate-supply curve is vertical because economic forces do not affect long-run
aggregate supply."
c. "If firms adjusted their prices every day, then the short-run aggregate-supply curve would be horizontal."
d. "Whenever the economy enters a recession, its long-run aggregate-supply curve shifts to the left."

Key Concepts

Potential Output and Economic Shocks

Long-run aggregate supply reflects the economy's potential output, determined by real factors like technology, resources, and institutions, and does not shift simply because of temporary economic disturbances such as recessions. Recessions are short-run deviations from potential output and do not cause permanent leftward shifts in long-run aggregate supply.

Price Adjustment Mechanisms

The idea that constant, everyday price adjustments would render the short-run aggregate supply curve horizontal is flawed because even with frequent price changes, there remain other factors such as menu costs, contractual wage and price settings, and adjustment lags that maintain some degree of rigidity in the economy.

Aggregate Demand Curve

The aggregate demand curve represents the relationship between the overall price level and the total quantity of goods and services demanded in the economy. Its downward slope is mainly due to effects such as the wealth effect, interest rate effect, and exchange rate effect, rather than being a simple horizontal summation of individual goods’ demand curves.

Short?Run vs. Long?Run Aggregate Supply

The distinction between short-run and long-run aggregate supply is crucial. In the short run, prices and wages are often inflexible, leading to an upward-sloping aggregate supply curve, while in the long run, the aggregate supply is determined by the economy’s productive resources and technology and is represented by a vertical curve at the level of potential output.

Transcript

00:01 Okay, question five, explain why the following statements are false.

00:07 So all of these four statements are false and we have to know why they are not true.

00:14 Okay, question a, question a, the statement is saying that the aggregate demand curve slopes downward because it is the horizontal sum of the demand curves or individual goods.

00:29 Well it is true that the aggregate demand curve is the sum of the demand curve for individual good it is true but the reason that it slopes downward is not because of it it is because the law of demand because we know that for every individual like for every individual consumer the more the cheaper the price well say the cheaper the good is the more like they can buy right so if the product is like very expensive they can just they can people can only buy a few but if the product is super cheap they can buy a lot so this is called a law of demand so this is just the main reason why the aggregate demand curve is down or sloping it does not, well, the reason is not because it is the sum of like other individuals demand because that is just the definition.

01:38 But the reason why it is downwards to be is because of the law of demand.

01:42 Okay, question b, the long run aggregate supply curve is vertical.

01:46 Yes, this is true.

01:48 It is vertical.

01:49 And because economic forces do not affect long run aggregate supply, so that is where this statement is false.

01:57 Because we know that, the vertical, the long run aggregate supply is vertical, right? it is vertical because long run aggregate supply.

02:11 Because price level, long run aggregate supply does not have any effect on it.

02:21 It is not because, as the question b says, it is not because economic forces do not affect long run aggregate supply.

02:30 We can just simply come up with the counter example because like the technological changes, it is actually going to change the loan and aggregate supply.

02:40 For example, if we have a huge technology revolution, we can produce more output.

02:47 This long run aggregate supply is going to shift to the right, right? so this is one of the fact that will change this curve.

02:57 In conclusion, it is vertical because it is not related to price, not because...

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