Talking to ET Now Bibek Debroy , Member, NITI Aayog , says there are some rules which will need to be clarified and tweaked and that should not take more than three months or so.Edited excerpts:There are a lot of people who simply did not believe that the deadline would be adhered to although there have been deadlines in the past. There has been a deadline in 2010, there has been a deadline in 2012. Sufficient notice was given, if notice is the right word to use, and there was sufficient consultations. People who are saying that they are unprepared, they have not been consulted, are being somewhat unfair.Obviously if there is going to be a change, there will be some amount of necessary adjustment, some issues of transitions, some change or tweak in rules. As far as the productivity question is concerned, it is impossible to estimate that.I understand that cigarette prices have come down of all things! So, people will presumably smoke more! I am using that trivial example to illustrate that there is no reason for this apprehension that people will consume less.You use the word “due to demonetisation.” You should be aware it is difficult to control everything. What the blip was due to, we do not really know and I want to flag that had it been due to demonetisation, you would have seen an effect in the nominal growth rate. The nominal growth rate shows no sharp dip, it is the real which is obtained by deflating the nominal with the deflator. So if I am going to buy that argument of “due to demonetisation,” then you will have to show me it has happened in the nominal growth rate. Otherwise you will have to explain to me why demonetisation should lead to a change in the deflator.What many people do not seem to realise because they cannot be bothered to check is that this was an estimate made for the ideal GST. We have only begun the process of moving towards that ideal GST.Why should GST have any impact on inflation if the government has already allayed the fears? Asking the question means that you have some fresh fears. So tell me what those fresh fears are.Monetary policy is a completely separate issue. You have presumed that it is going to have some effect on inflation.I would not use the word unfair. Obviously, there are problems, there are transition problems and if one comes across a problem, it is reasonable on the part of the government to adjust the rules. Had the government not listened, you would have come and said is’nt it unfair of the government not to listen to this? So, the government gets it both ways.It depends on the definition of the pain. There are some rules which will need to be clarified and tweaked that should not take more than three months or so.The Union government has guaranteed that it will compensate the stage for every revenue losses but I would say it is too early to judge that.