Former Chief Economic Adviser Arvind Subramanian on Sunday warned the Indian economy was in for a slowdown for some time as agriculture and financial system were under stress. Speaking at the release of his book, Of Counsel: The Challenges of the Modi-Jaitley Economy, he said both demonetisation and implementation of Gave resulted in moderation of the economy and the budget estimate of revenue collection from the Goods and Services Tax (GST) seems to be unreasonable.