Why does Inflation Risk (Purchasing Power Risk) inflict the most severe structural damage on long-term fixed-rate debt instruments compared to equity shares?

[ A ]Because fixed-rate bonds pay fixed nominal coupon and principal amounts whose real purchasing power is eroded when inflation rises, whereas corporate revenues and profits naturally adjust upward with product price inflation over time.[ CORRECT ]

[ B ]Because bond issuers are legally required to default on 100% of debt obligations whenever inflation reaches 2%.

[ C ]Because equity shares are guaranteed by the Reserve Bank of India to pay a fixed 20% annual cash dividend.

[ D ]Because inflation reduces bond coupon interest rates to negative numbers on the printed bond certificate.

Takeaway

Option A is correct: Because fixed-rate bonds pay fixed nominal coupon and principal amounts whose real purchasing power is eroded when inflation rises, whereas corporate revenues and profits naturally adjust upward with product price inflation over time.

Derivation

Inflation Risk is the danger that future cash flows received from an investment will purchase fewer goods and services due to rising price levels. Fixed-rate debt securities (bonds, fixed deposits) are most vulnerable because their cash flows (coupon and principal repayment) are fixed in nominal rupee terms; if inflation exceeds the coupon rate, the real rate of return becomes negative. In contrast, operating companies can pass on higher input costs by raising product selling prices, allowing nominal revenues, earnings, and equity intrinsic values to grow with inflation over the long term. This tests inflation risk dynamics. The common error is thinking safe bank deposits are free of inflation risk.

Why the others fail

B — Because bond issuers are legally required to default on 100% of debt obligations whenever inflation reaches 2%.

Bond issuers continue paying fixed contractual coupons; the risk is the loss of real purchasing power of the money received, not automatic default.

C — Because equity shares are guaranteed by the Reserve Bank of India to pay a fixed 20% annual cash dividend.

Equity shares carry market-linked risk and are never guaranteed by central banks to pay fixed dividends.

D — Because inflation reduces bond coupon interest rates to negative numbers on the printed bond certificate.

Contractual nominal coupon rates remain constant on the certificate, while their real inflation-adjusted purchasing value declines.