The important part of their paper is the recognition that there is not sufficient certainty around the existing prohibition for judges. (slaw.ca)
For example, renewable energy industry representatives have stated that the 2 - year extension of the production tax credit in the Energy Policy Act of 2005 does not provide sufficient certainty to stimulate investment. (resilience.org)
Courts have found that such terms would be of sufficient certainty to found an enforceable contract, assuming that all other essential terms have enough certainty. (nerlandlindsey.com)