A number of terms for different kinds of additionality have been discussed, leading to some confusion, particularly over the terms 'financial additionality' and 'investment additionality' which are sometimes used as synonyms. 'Investment additionality', however, was a concept discussed and ultimately rejected during negotiation of the Marrakech Accords. Investment additionality carried the idea that any project that surpasses a certain risk-adjusted profitability threshold would automatically be deemed non-additional. 'Financial additionality' is often defined as an economically non-viable project becoming viable as a direct result of CDM revenues.