"Cautious".............................

 

     Franklin, however, was no Malthusian pessimist.  He believed that, at least in America, increased productivity would keep ahead of population growth, thus making everyone better off as the country grew.  In fact, he predicted (also correctly) that what would restrain American population growth in the future was likely to be wealth rather than poverty, because richer people tended to be more "cautious" about getting married and having children.

-Walter Isaacson, Benjamin Franklin, An American Life