What group of elements does the shaded area in the following periodic table indicate? 
Definitions:
Market Yield
The annual income return on an investment, expressed as a percentage of the market price, reflecting the current consensus on the investment's future performance.
Coupon Bond
A bond that pays the holder a fixed interest payment (coupon) periodically until the maturity date, when the principal amount is reimbursed.
Coupon Bond
A type of bond that offers the holder periodic interest payments, with the principal repaid at maturity.
Yield To Maturity
The total return anticipated on a bond if the bond is held until it matures.
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