- The AoA categorises domestic support measures into three boxes—green, blue, and amber based on their trade-distorting nature.
Green box
- Subsidies that do not distort trade or, at most, cause minimal distortion are in this box. Usually, these subsidies are not directed at specific products.
- There is no limit on governments for giving this kind of subsidies to their farmers.

Amber Box
- The subsidies that distort international trade by making products of a particular country cheaper as compared to similar products from another country are slotted under this box.
- Example – Input subsidies such as subsidies on electricity, seeds, fertilisers, irrigation, etc. Market support price (MSP) subsidies also fall under this box.
- To measure ‘amber box’ support, WTO member countries are required to compute the aggregate measure of support (AMS).
- The AMS means the annual level of support (subsidies) expressed in monetary terms provided for an agricultural product. It includes both product-specific & non-product-specific support.
- The fixed external reference price is used to calculate the AMS to determine compliance with subsidy limits.
- The fixed external reference price shall be based on the years 1986 to 1988.
- WTO limits this subsidy by capping it at 5% for developed countries & 10% for developing countries of their total agriculture production. (de minimis).
Blue Box Subsidies
- According to the WTO, the Blue Box is the “amber box subsidy with conditions” attached.
- The Blue Box subsidies aim towards limiting production by imposing production quotas or requiring farmers to set aside part of their land.
- Blue Box subsidies are also exempted from the calculation of AMS.
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