The Aam Aadmi Party (AAP) on Monday lashed out at Prime Minister Narendra Modi's demonetisation decision and said the decrease of 3 per cent in the Gross Domestic Product (GDP) rate has cost the country more than Rs 4.5 lakh crore.Addressing the media in the state capital, AAP's national spokesman and in-charge of the state unit, Sanjay Singh said demonetisation was now turning out to be the "biggest scam ever" in the country."Party Convener and Delhi Chief Minister Arvind Kejriwal had earlier also warned the people against the scam and now the RBI has proved his apprehensions correct," Singh said.All clarifications given for the sudden demonetisation move had turned out to be fake now, the senior AAP leader said, claiming that the move had neither led to a reduction in terror activities nor put an end to naxalism.Singh said the introduction of the Goods and Services Tax (GST) was also an attempt by Prime Minister Modi to benefit some of his "favourite industrialists"."The tax burden on people is increasing with each passing day and the economy is crumbling due to unplanned and erratic policies," he added.The AAP leader also took on the Uttar Pradesh government and said it was unfortunate that in the wake of tragedies like the deaths of hundreds of children in Gorakhpur and Farrukhabad hospitals, Chief Minister Yogi Adityanath and his ministers were dishing out insensitive statements.He also accused the state government of trying to cover up the tragedies and save their favourites involved in them.