Japan's productivity growth has stalled below 2% for two decades, widening gaps with other economies. With its shrinking workforce, Japan needs productivity gains to boost GDP growth to 3% annually by 2025. Capturing just half of the potential 28% productivity increase could add $1.4 trillion to 2025 GDP. While policy changes can help, companies hold the key - they can immediately invest and innovate, constituting a "fourth arrow" of Abenomics. Focusing on revenue growth and efficiency in advanced manufacturing, retail, finance and healthcare could capture one-third of productivity potential.