Macroeconomics
Macroeconomics
4th Edition
ISBN: 9781464110375
Author: Paul Krugman, Robin Wells
Publisher: Worth Publishers
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Chapter 1, Problem 1P
To determine

The appropriate principle of individual choice used.

Concept Introduction:

Principles of Individual Choice:

  • “Choice is necessary because resources are scarce”- Resources are always scarce in respect to its use, a single resource can be put to various alternative uses. Therefore, one has to choose between the various uses.
  • “The true cost of something is its opportunity cost”- The value of any commodity is derived from the forgone cost to get that particular commodity.
  • “How much is the decision at the margin”- The choice of having something depends on the benefits one receive from that choice.
  • “People usually exploit opportunities to make them better off”- People are always fond of alternative incentive, which can make them in better situation as compared to the previous situation.
  • Gains from trade”- Individual always gain from trade by selling the product in which they are specialized and purchasing the product in which they are comparatively less specialized.
  • “Market moves towards equilibrium”- Market always tries to settle down at a point where no individual is comparatively better off in changing his choice.
  • “Resources should be used efficiently to achieve society’s goals”- Resources should be used in such a way that will not make any better off by making the other individual worse off.
  • “Markets usually lead to efficiency”- People always look for the opportunity, which can make them better off without making any other person worse off, this leads to efficiency in the market.
  • “When markets don’t achieve efficiency, government intervention can improve society’s welfare”- Government intervention is required when the market do not correct itself.
  • “One person’s spending is another person’s income”- The economy will always go on because a person earns only when the other person spends.
  • “Overall spending sometimes gets out of line with the economy’s productive capacity”- The economy can face inflation at the time when spending of whole economy raises all together.
  • “Government policies can change spending”- Various fiscal and monetary policies of government are used to correct the situation of the economy and adjust the spending.

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Suppose that a random sample of 216 twenty-year-old men is selected from a population and that their heights and weights are recorded. A regression of weight on height yields Weight = (-107.3628) + 4.2552 x Height, R2 = 0.875, SER = 11.0160 (2.3220) (0.3348) where Weight is measured in pounds and Height is measured in inches. A man has a late growth spurt and grows 1.6200 inches over the course of a year. Construct a confidence interval of 90% for the person's weight gain. The 90% confidence interval for the person's weight gain is ( ☐ ☐) (in pounds). (Round your responses to two decimal places.)
Suppose that (Y, X) satisfy the assumptions specified here. A random sample of n = 498 is drawn and yields Ŷ= 6.47 + 5.66X, R2 = 0.83, SER = 5.3 (3.7) (3.4) Where the numbers in parentheses are the standard errors of the estimated coefficients B₁ = 6.47 and B₁ = 5.66 respectively. Suppose you wanted to test that B₁ is zero at the 5% level. That is, Ho: B₁ = 0 vs. H₁: B₁ #0 Report the t-statistic and p-value for this test. Definition The t-statistic is (Round your response to two decimal places) ☑ The Least Squares Assumptions Y=Bo+B₁X+u, i = 1,..., n, where 1. The error term u; has conditional mean zero given X;: E (u;|X;) = 0; 2. (Y;, X¡), i = 1,..., n, are independent and identically distributed (i.i.d.) draws from i their joint distribution; and 3. Large outliers are unlikely: X; and Y, have nonzero finite fourth moments.
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