The theoretical concept of joint implementation and the idea of reducing greenhouse gas emissions where costs are least is still charming and - at least for economists - no revolution. However, one of the most critical aspects regarding joint implementation is the question of ＇additionality＇, Some argue that a ＇real＇ joint implementation project may not have any commercial value at all, others propose that the value of emissions reduction credits shall bring about a positive return on investment where otherwise it would have been negative, The present paper states that there is no feasible option to divide projects into joint implementation and non-joint implementation candidates regarding their financing. The result is that any project which brings about real and measurable environmental and social benefits should be regarded as a possible joint implementation project, be it a pure donation or a highly profitable private investment.