Sentence:  The inner life of congregations will prosper so long as like-minded people of similar social and economic level can fraternize together ; the outer life of congregations - the suitability of the environment to their survival - will be propitious so long as the people in the area are of the same social and <WSD>economic</WSD> level as the membership . 
Meaning of the word marked with <WSD> tags:  of or relating to an economy, the system of production and management of material wealth