Journal editor: Our treasurer advises that because of our precarious financial situation, we should change from a paper version to an online version only if doing so will not increase the cost of publication  The cost of converting from a paper version to an online version is high; however, once the conversion is made, the cost per issue is much lower for an online version
Since a benefactor has agreed to cover the costs of conversion, and since we can safely assume that our treasurer is right, we should change to an online version
treats meeting a necessary condition for changing from a paper to an online version as a sufficient reason for changing