In the ZERO marginal cost condition, a lot of economic activities do not contribute to an increasein Gross Domestic Product; GDP. It seems that public debt as a percentage of GDP expands over time,though there is an idea that there is no need to measure GDP.This research is not honestly be able to accept zero growth when thinking about public finance. The aim of Public Finance by the complement system is securing sources of funds for repaying public debt.The public sector in the broad sense including large private sector has held the position of creating necessities against the background of materializing the ZERO marginal cost condition. In oligopolistic condition, some private enterprises reach a new stage of growth increasing tax-paying capacity based on the complement system of public bond market. This research proposes that the complement system of public bond market which is composed of discretionary initial public offerings and Shijohkankeisha Exchange Trading System; SETS. The public sector in the broad sense including large private sector takes on the role of an investor, and then facilitates transactions with SETS. We are able to experience collaboration and the commons in harmony with nature.
Hiromasa NAKAMURA (Wed,) studied this question.