Only people with very low IQ think that Manmohan and Chidambaram understand Economics. How can anyone who is for socialism get credit for understanding Economics? It is just not possible. Neither of them understands Economics. People confuse knowledge of English with Economics.
Here are some home truths -- Chidambaram was a socialist/Communist in the 1970s and 1980s proving beyond all reasonable doubt that he is a foolish person. Manmohan was instrumental for socialism for 30 years of his career. He was in every socialist position like Planning Commission Chairman, Indo-Soviet Trade Commision, RBI, adviser to Finance Ministry etc.
In short, he is a fool who does not understand Economics. He is suitable for being an obedient servant. PVN understood this very well and so gave him orders to open up the economy. Even though Manmohan did not understand what opening up the economy meant, he was a good servant and knew to execute orders. So some good came out of it. The credit for opening up the economy goes to PVN.
Now, Manmohan executes Communist ideas. He takes orders from Sitaram Yechury and Sonia Maino. He actually stands up for the entire time when Sonia Maino is around.