In the graph, calculate the value of producer surplus in this market. 
Definitions:
Perpetuity
An annuity in which the periodic payments begin on a fixed date and continue indefinitely.
Long-Term Bonds
Debt securities with a maturity of more than 10 years, offering periodic interest payments.
Interest Rates
The cost of borrowing money, expressed as a percentage of the amount loaned, payable to the lender at a specified rate over a given period.
Borrowing Directly
The process where individuals or entities obtain funding directly from lenders without intermediaries, typically through issuing bonds or obtaining loans.
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