The world's investors have been obsessing with when the US Federal Reserve will end the era of near-zero interest rates, as America's economy returns to almost-normal shape.
But maybe they've been looking at the wrong monetary tool and the wrong economy, in respect of what matters to the flows of capital across borders and economic activity.
Because the decision of the People's Bank of China (PBOC) to devalue the yuan by 1.9% will have global ramifications, in the short, medium and long-ish term.
Immediately it will increase the competitiveness of China's exports at a time when the country's economy is growing at its slowest rate for six years - and when many economists fear that the slowdown will become much more painful and acute.