The aim of this thesis is to discover useful measures and worthwhile lessons in increasing savings for capital formation to promote economic growth in underdeveloped countries. In order to accomplish this goal, the following steps will be taken: (1) The various kinds or concepts of savings, i.e., voluntary saving (including savings from utilization of under-employed labor), compulsory saving through taxation, and forced saving from inflation resulting from deficit financing of investment by means of bank loans or fiat money will be examined, analyzed, and discussed with the aim of finding useful measures for increasing savings from them to promote capital formation.; (2) The ideas of various writers on economic development that are directly related to the problem will be analyzed to discover worthwhile lessons from them.; (3) The relevant experiences of certain developed and underdeveloped countries will be looked into, and any useful measures or lessons discovered from them will be presented and their significance indicated.