Arun Jaitley. Pic/PTI

Union Finance Minister Arun Jaitley on Sunday said the tax payer base, tax collections and digitization of the economy are expanding following a series of measures taken by the central government led by Prime Minister Narendra Modi. In his address at the 48th annual reader's meet of Tamil magazine 'Thuglak' here, Jaitley said the demonetisation of high value currencies was a difficult decision for the Prime Minister to take but added it was Modi only who had the "courage to take such a decision".