Lending to Agribusinesses in Zambia



It is clear from the equation for the budget constraint with borrowing (equation 6)
that the expected return on investment must equal or exceed the cost of borrowed funds rb
in order for a rational individual to borrow.

The borrower faces the prospect that the risky project will not succeed, in which
case the payoff structure takes the form of an option. Borrowed funds B are not repaid,
and C1 is limited to the amount saved. The borrower’s payoff is represented by an
asymmetric function, which illustrates the incentive to default. Figure 3 illustrates the
borrower’s option to default. The total value of the investment in period 2 is R. Because
the project is a risky venture, outcomes for R can be anywhere along the horizontal axis,
from worthless to a large amount. When R is resolved at a large value, the borrower has
an incentive to repay the loan plus interest and gains positive payoff of the project value
R above the debt repayment. When R is small, or when 0, the borrower has the incentive
to default. The borrower’s payoff is a call option, or opportunity to reduce losses to 0
through defaulting on debt B.

Figure 3. Borrower’s payoff structure with default option

Ignoring all social or institutional pressures for the moment, the payoff to a borrower can
be represented in monetary terms as:

10



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