Sentence:  Churches can be strengthened through this process of co-optation so long as the environs of the church provide a sufficient pool of people who can fit the pattern of <WSD>economic</WSD> integration ; once the pool of recruits diminishes , the congregation is helpless - friendly contacts no longer keep it going . 
Meaning of the word marked with <WSD> tags:  of or relating to an economy, the system of production and management of material wealth