Dr. Rangarajan's contributions are well known and well documented in a number of publications, both Indian and international. But it has been strongly felt, particularly by his colleagues who worked closely with him, that his research contributions to various sectors of Indian economy are not available at one place. The present publication is an attempt to fill this gap and to provide easy access to some of his path-breaking articles which are frequently referred to. Dr. Rangarajan's contributions are not confined to monetary economics, as one may usually think, but they cover a wide range - agriculture, industry, planning, banking, finance, balance of payments, exchange rate policy, and international monetary system. These subjects have been covered in the 24 selected essays which have been arranged under four sections in two volumes.