Prove the identity. 
Definitions:
Contract Rate
The agreed-upon interest rate specified in a contract, particularly in loan agreements or bond indentures.
Bond Indenture
A legal contract specifying the terms and conditions between the bond issuer and the bondholders.
Effective Interest Rate
The actual return on an investment or the real rate of interest calculated annually after considering compounding.
Market Interest Rate
The market interest rate is the prevailing rate at which borrowers are willing to borrow money and lenders are willing to lend in the financial markets.
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