国际货币基金组织：从太空看全球贸易（英文版）

We introduce a nowcasting model of global maritime trade, leveraging satellite-based big data on vessel movements. This provides a timely indicator of global trade as shipping accounts for about 80 percent of worldwide merchandise trade by volume. Our approach mimics key features of the way statisticians compile trade data—measuring the customs value of imported and exported goods first, forming import and export price deflators, and then estimating import and export volumes. We show how glob