From: News with Views
… The moneychangers of Jesus’ day were the equivalent of the international bankers of our day. With the consent and approbation of the Jewish leaders, these bankers set up shop in the Temple. Their purpose was to exchange whatever currency the Jewish worshipper brought with him or her into Jewish currency, which would then be used to purchase whatever sacrifice the worshipper required. Of course, the exchange rates benefited only the bankers and Jewish leaders (and Caesar, who collected a tax on the exchange, of course). For everyone else, the system was nothing more than legalized extortion.
When Jesus saw what the bankers were doing, He was incensed. And throughout the Gospel narratives, this is the only occasion where Jesus is recorded as resorting to violence. He made a scourge (or whip) and drove the bankers out of the Temple by force and destroyed their tables, along with their records, receipts, etc.
It is too bad that today’s pastors and Christians do not share Jesus’ disdain for the current generation of moneychangers, because it is the moneychangers who are in the process of destroying these United States of America–and our pastors and Christians either do not see it, or, if they do see it, do not seem to care.