He was speaking at a forum on climate change and food security organized by the South Asia Watch on Trade, Economics and Environment (SAWTEE), Kathmandu, and Institute of Policy Studies of Sri Lanka.
Chatterjee said India had in the recent past stopped onion exports and there were instances where rice exports were also restricted.
Shortly before the 2008 commodity bubble collapsed, countries ranging from Vietnam to India restricted rice exports.
Food exports restrictions were imposed by the US as the dollar went off the gold standard in 1971 (the Nixon shock), as oil and gold prices hit new highs due to bad monetary policy by the US Federal Reserve which weakened the dollar.
The US lifted the restrictions within six months after classical econ