Pension Unification Under Macroeconomic Uncertainty: Fiscal Risk and Sovereign Debt Dynamics in Ghana

Abstract

This paper develops a stochastic overlapping generations dynamic social security framework

to evaluate the sovereign debt implications of pension unification under macroeconomic

uncertainty in Ghana. The analysis focuses on the counterfactual integration of the Cap 30

scheme, a legacy non-contributory defined-benefit arrangement for security, intelligence, and

judicial personnel, into the contributory three-tier framework established under the National

Pensions Act, 2008 (Act 766), relative to the fragmented baseline created by the 2023

amendment that exempted security agencies from unification. The model incorporates four

estimated AR(1) macroeconomic shock processes, real GDP growth, real interest rates, the

primary fiscal balance, and the terms of trade, calibrated using Ghanaian data spanning 1961–

2024. It simulates 3,000 stochastic debt paths under alternative recognition bond designs,

Bohn-type fiscal reaction rules, and reform timelines, generating a time-varying probability

distribution of fiscal outcomes.

The paper fins that first, pension unification lowers the probability of public debt breaching a

100 percent threshold at a 20-year horizon by approximately 3 percentage points relative to

the fragmented baseline, the measurable risk-mitigation margin of the 2023 amendment's

opportunity cost. Second, macro-fiscal consolidation dominates pension design as a

stabilization mechanism: strengthening the fiscal rule responsiveness reduces the same

breach probability by over 30 percentage points, accounting for roughly 88 percent of the total

achievable risk reduction. Third, recognition bond asset design matters materially within

Ghana's highly volatile monetary environment; inflation-linked bonds introduce dangerous tail

risk through state-contingent liability compounding, whereas fixed-coupon and GDP-linked

structures generate highly stable outcomes. Fourth, Ghana's nearly two-decade impasse has

generated severe path-dependent hysteresis, with cumulative forgone operational savings

estimated at approximately 5 percent of GDP. The results demonstrate that macro-fiscal

governance parameters dominate individual pension adjustments. Pension unification yields

structural fiscal benefits, but it cannot function as a substitute for the rule-backed fiscal

consolidation necessary to place the sovereign debt trajectory on a sustainable path.