Ownership and planning
Most factories and commercial enterprises remained privately owned. The government set national standards, funded research, placed long-term procurement contracts and financed infrastructure, while businesses competed for civilian and export markets. Public ownership continued in selected institutions and strategic facilities, including the government education system and parts of the established aircraft industry. The national plan directed investment without making the Commonwealth the owner of most production.
Development finance
Reconstruction drew on resource royalties, industrial and agricultural exports, taxation and development finance together. Public investment banks and long-term infrastructure bonds spread the cost of shipyards, power stations, housing and research capacity across successive decades. Export earnings paid for specialist imports and helped sustain firms beyond military contracts. Parliamentary budgets still had to balance debt service, public benefits and defence; industrial growth enlarged the revenue base without removing those costs.
Defence expenditure
Normal peacetime defence expenditure was maintained at 10 to 12 percent of GDP. That unusually high commitment financed the fleet, military aviation, reserves and continuing weapons development, while wartime appropriations could rise above it. Governments generally worked nearer the lower end during stable periods and towards the upper end during major construction or mobilisation. Civilian education, healthcare and infrastructure required their own funding alongside that defence allocation. The commitment brought high taxes and recurring arguments over household consumption, investment priorities and the pace of military expansion.
Southern Dollar
The Southern Dollar became the common currency, administered by the Southern Reserve Bank. Decimal currency retained 100 cents to the dollar. Monetary stability, public development lending and a regulated private banking system supported industry and household saving. Separate Australian and New Zealand monetary institutions were coordinated during union and consolidated into the common national system.
GDP and per-capita output
At the 2026 estimate of 104 million residents and nominal output of US$100,000 per resident, nominal GDP was US$10.4 trillion. A population of exactly 100 million at the same per-capita level would produce US$10 trillion. These were current-dollar output measures, not an exchange rate, government revenue or purchasing-power-parity estimate. Peacetime defence spending at 10–12 percent of the 2026 total implied US$1.04–1.248 trillion annually; civilian benefits and infrastructure were funded separately.
Resources and diversification
The expanded minerals base supplied iron ore, coal, uranium, gold and industrial rare earths. Steel was manufactured from ore and other inputs rather than treated as a natural deposit. The late-1930s discoveries widened the tax and export base, but manufacturing, semiconductor design, pharmaceuticals and services supplied a growing share of later value. The national economy was built around public capacity and productive people as well as military procurement.