Anniversary No. 1: Exactly four years ago, Lehman Brothers filed for bankruptcy protection. In the days and weeks that followed, we saw the unfolding of the dramatic — and ultimately successful — effort by the federal government to rescue the banking system. But, once the dust settled, we began to see something else: like the stock market crash of 1929, Lehman wasn’t an isolated event. Rather, it was a signal that deep problems had enveloped our economy — problems that wouldn’t be solved quickly or easily. That is why the Lehman bankruptcy still resonates. It was the moment everything changed.