Case Study

Crafting a Mutually Beneficial Loan Agreement

Consider two individuals, Julia and Marco, with different endowments and preferences for consumption over two periods (today and tomorrow).

  • Julia (potential borrower): Has an endowment of $20 today and will have $100 tomorrow. She is impatient and wants to consume more today. Her personal valuation is that she is willing to give up as much as $1.20 tomorrow to have an extra $1.00 today.
  • Marco (potential lender): Has an endowment of $100 today and will have $20 tomorrow. He is patient and would like to save for tomorrow. His personal valuation is that he is willing to lend $1.00 today as long as he gets back at least $1.05 tomorrow.

Based on this information, propose a specific loan amount and an interest rate that would be mutually beneficial. Justify your answer by explaining how the loan makes both Julia and Marco better off compared to their initial situations.

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Updated 2025-08-03

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