In a liquidity crunch banks issue few loans (in terms of value) whilst when the economy is doing well banks issue more loans. In both scenarios we banks tend to either under issue or over issue loans. Borrowing from the Economic Order Quantity idea in inventory management, banks should be able to identify an optimum level in their loan portfolios. Given such model, each bank will be able to issue loans up its level of minimum loan costs and maximum loan returns. My question therefore is, what variables should we take into account in order to establish or to come up with a model that helps establish that optimum level of loan portfolio.  

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