In this article, Luiz Zorzella explains how understanding the net interest margins will better inform your business strategy.   If you are a bank executive and want to manage the bank’s business strategically, you must understand the key drivers of your bank’s profitability and the trade-offs they imply. For example, to some extent, banks can trade the cost of deposits for efficiency ratio by making it more convenient for clients to make deposits. At the same time, the equilibrium of these…