Ebrima gets $3 per month as an allowance to spend any way he pleases. Because he likes only peanut butter and jelly sandwiches, he spends the entire amount on peanut butter (at $.05 per ounce) and jelly (at $.10 per ounce). Bread is provided free of charge by a concerned neighbor. Ebrima is a picky eater and makes his sandwiches with exactly 1 ounce of jelly and 2 ounces of peanut butter. He is set in his ways and will never change these proportions.  How much peanut butter and jelly will Ebrima buy with his $3 allowance in a week?  Suppose the price of jelly were to rise to $.15 per ounce. How much of each commodity would be bought?  By how much should Ebrima’s allowance be increased to compensate for the rise in the price of jelly in part b?

ENGR.ECONOMIC ANALYSIS
14th Edition
ISBN:9780190931919
Author:NEWNAN
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Chapter1: Making Economics Decisions
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Ebrima gets $3 per month as an allowance to spend any way he pleases. Because he likes only peanut butter and jelly sandwiches, he spends the entire amount on peanut butter (at $.05 per ounce) and jelly (at $.10 per ounce). Bread is provided free of charge by a concerned neighbor. Ebrima is a picky eater and makes his sandwiches with exactly 1 ounce of jelly and 2 ounces of peanut butter. He is set in his ways and will never change these proportions. 

  1. How much peanut butter and jelly will Ebrima buy with his $3 allowance in a week? 
  2. Suppose the price of jelly were to rise to $.15 per ounce. How much of each commodity would be bought? 
  3. By how much should Ebrima’s allowance be increased to compensate for the rise in the price of jelly in part b? 
  4. Graph your results of part a through part c. 
  5. In what sense does this problem involve only a single commodity—peanut butter and jelly sandwiches? Graph the demand curve for this single commodity. 
  6. Discuss the results of this problem in terms of the income and substitution effects involved in the demand for jelly.
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