Fiscal rigidity traps occur when a government's expenditure base is so locked into non-discretionary commitments — subsidies, public wage bills, debt service, quasi-fiscal obligations — that it has no room to adjust when revenues fall or shocks hit.
The trap is self-reinforcing: committed expenditure grows during boom years, when it feels affordable, and then proves impossible to cut when bust arrives. The result is procyclical fiscal policy — spending is constrained precisely when stimulus is most needed.
Countries most vulnerable are those that entered boom periods with weak fiscal institutions and used windfall revenues to expand subsidies and public employment rather than save.
How It Operates
Fuel & Food Subsidies
Energy and food subsidies are politically difficult to remove once established, creating large and poorly targeted fiscal commitments that grow with prices.
Public Wage Bill Expansion
Hiring and wage increases during boom periods create permanent expenditure commitments that are extremely difficult to reverse.
Debt Service Obligations
As borrowing accumulates, debt service consumes an increasing share of the budget, crowding out discretionary development spending.
Policy Implications
- → Apply structural balance rules that prevent the wage bill and subsidy expenditure from rising as a share of GDP during commodity booms
- → Reform subsidies toward targeted cash transfers that are easier to adjust
- → Maintain a fiscal buffer (stabilisation fund) to absorb shocks without cutting capital expenditure