Covid-19 and Optimal Portfolio Selection for Investment in Sustainable Development Goals

The Covid-19 pandemic and global economic recession has shrunk global energy demand and collapsed fossil fuel prices. Therefore, renewable energy projects are losing their competitiveness. This endangers the achievement of several Sustainable Development Goals (SDGs) and the Paris Agreement on Climate Change. Various consulting companies define the SDGs differently. Institutional investors hire consulting companies and allocate their investment based on the consultants’ suggestions. This paper theoretically shows that the current allocation of investors by considering SDG based on various consulting companies will lead to distortion in the investment portfolio. The desired portfolio allocation can be achieved by taxing pollution and waste such as CO(2), NO(x), and plastics, globally with the same tax rate. Global taxation on pollution will lead to the desired portfolio allocation of assets.