Currency notes of Rs.500and Rs.1,000 denomination that are currently in circulation will no longer be legal money and cannot be used as medium of exchange from Tuesday midnight,as Prime Minister Narendra Modi in a surprisemoveclampeddownonblackmoney as well as counterfeit notes in circulation.Instead,the Reserve Bank of India(RBI)will issue new Rs.500 and Rs.2,000 currency notes on Thursday.“The arrangement of buying and selling through existing Rs.500 and Rs.1,000 notes will not be available.These will be just worthless piece of paper,”Modi said in his hurriedly announced address to the nation on Tuesday evening. Existing currency notes of Rs.1,2,5,10 and 100 denomination as well as coinscontinue to be legal and could be used for buying and selling. Economists said the move would immediately press a pause button on transactions that were planned in black money.On the other hand,ordinary transactions such as buying of vegetables from the local market might be hit for a month, the