Public Debt: Classification and Methods of Redemption

Public debt refers to the borrowings of the government, undertaken when its expenditure exceeds the revenue it can raise through taxation and other non-debt sources. Public debt can be classified along two independent dimensions.

By source — Internal and External Debt. Internal debt is borrowed from within the country — from the central bank, commercial banks, financial institutions and the general public, typically through government bonds and treasury bills. External debt is borrowed from outside the country — from foreign governments, international institutions, or through bonds issued in foreign currency; external debt carries the additional burden of repayment in foreign exchange and exposure to exchange-rate movements.

By purpose — Productive and Unproductive Debt. Productive debt is borrowed to finance capital assets that are expected to generate income or returns over time — for example, debt raised to build a power plant, railway line, or irrigation project, which can, in principle, be "self-liquidating" as the asset generates revenue. Unproductive debt is borrowed to finance expenditure that creates no corresponding asset — for example, debt raised to cover a war expenditure or a purely consumption-type revenue shortfall — leaving future generations with the repayment burden but no matching asset.

Methods of Redemption (repayment) of Public Debt:

1. Sinking Fund — the government sets aside a fixed amount every year into a separate fund; this fund, together with the interest it earns, accumulates over the life of the loan until it is sufficient to repay the debt fully at maturity.
2. Terminable Annuities — instead of one lump-sum repayment at maturity, the government converts a loan into a series of equal annual payments (annuities), each containing both interest and a portion of the principal, spread over a fixed number of years, so the debt is fully extinguished by the end of that period.
3. Conversion — an old loan carrying a higher rate of interest is replaced with a new loan carrying a lower rate of interest (typically done when market interest rates have fallen since the old loan was issued), reducing the government's future interest burden without necessarily repaying the principal immediately.
4. Repudiation — an extreme and rare method where the government simply refuses to honour its debt obligation; while it eliminates the immediate debt burden, it severely damages the government's creditworthiness and its ability to borrow in the future.

Two-way classification of Public Debt:

| | Productive | Unproductive |

|---|---|---| …