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Consider the basic setup of the Diamond-Dybvig (1983) model. Specifically, there are three periods, denoted t=0,1,2, a single consumption good, and an illiquid investment opportunity

Consider the basic setup of the Diamond-Dybvig (1983) model. Specifically, there are three periods, denoted t=0,1,2, a single consumption good, and an illiquid investment opportunity that pays gross return 1 if liquidated at t=1, or gross return 1.9 if liquidated at t=2.

There are 1000 people in the economy, each endowed with 1 unit of the consumption good at t=0. At t=1, exactly half (500 people) will randomly realize that they need to consume at t=1 (the early consumers), the remaining 500 people will need to consume at t=2 (the late consumers). The utility derived from consumption is 1 - (1/c1) 2 for early consumers, 1 - (1/c2) 2 for late consumers, where the subscript denotes the time of consumption.

  1. Calculate the expected return (from a t=0 perspective) of depositing with this bank. How does it compare to the expected return from direct investing?

Suppose the bank offers a different asset instead, one that pays the same return, Rd, to all depositors (i.e., regardless of the time of liquidation).

  1. What is the highest gross return Rd that the bank can offer all depositors?
  2. Now suppose the late consumers pretend to be impatient and withdraw early. How many people can be paid before the bank runs out of funds?

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