Japan just put a number on its ambitions, and it’s a big one. The country plans to mobilize 370 trillion yen, roughly $2.3 trillion, in combined public and private investment by fiscal year 2040.

The strategy, announced by Prime Minister Sanae Takaichi on June 20, spans 17 strategic sectors. Think AI, semiconductors, space development, shipbuilding, and critical minerals.

The numbers behind the strategy

Two sub-targets stand out from the broader $2.3 trillion figure.

First, Japan wants to increase domestic semiconductor sales fivefold, bringing them to approximately $254 billion by 2040.

Second, the government plans to allocate $65 billion specifically for physical AI investments by 2040. Physical AI, which generally refers to AI systems that interact with the real world through robotics, autonomous vehicles, and industrial automation, is a natural fit for a country facing one of the most severe demographic declines on the planet.

Takaichi’s economic playbook

The initiative fits neatly into what observers have started calling “Sanaeomics,” a reference to the PM’s broader economic philosophy. The core idea: use public spending as a catalyst to unlock private capital at scale.

This isn’t Japan throwing $2.3 trillion of government money at the problem. The framework relies on public investment creating the conditions, through subsidies, tax incentives, and infrastructure spending, that make private sector participation attractive. The government has reportedly considered tools like bridging bonds and a structured multiyear budget to smooth out the spending over the roughly 15-year timeline.

To put $2.3 trillion in context, that’s roughly equivalent to the entire GDP of Italy. Spread over 15 years, it averages out to about $153 billion annually in combined public and private capital deployment across these sectors.

Japan has been steadily building momentum in the semiconductor space, attracting major investments from companies like TSMC, which has been constructing fabrication plants in Kumamoto prefecture.

What this means for investors

The public-private partnership model means that the government is essentially de-risking certain investments. When a sovereign nation commits to backstopping capital deployment in specific sectors, it lowers the perceived risk for private investors, both domestic and foreign.

Investors would be wise to track annual budget allocations and actual disbursements rather than anchoring to the topline figure.