Food security: India's stockholding & subsidy stand at WTO and why it's key

Business Standard explains the issue that is said to have derailed the WTO negotiations at Buenos Aires

The much-talked-about World Trade Organization (WTO) negotiations in Argentina collapsed after participating countries failed to reach a common ground on food and agriculture subsides, a key concern that India raised and on which, according to some reports, refused to dilute its stance till a permanent solution was reached.

Even after hectic parleys, the member nations failed to break an impasse over the public food stockholding issue on the fourth and final day of the ministerial conference. 

What are these food subsidy and public stockholding issues that have been the sticking point in the negotiations? Broadly, they cover the following:

India, along with some