Repatriation of export proceeds
The duty on exporters to bring earned currency home and sell part of it.
How to read the number
It creates a standing supply of currency that barely responds to price: the rate is then held by importers' demand pushing against that flow.
When the metric lies
The requirement is introduced and lifted by decision rather than by the market. When it goes, the supply disappears at once and the chart breaks where no market reason for a break existed.
Also known as: mandatory sale of export earnings