Ernst & Young recently explored past commodity price drops, looking for signs that an end to our current downturn is in sight. At 75%, this has been the most significant commodity price drop in history, the firm reports. Past drops lasted an average of 73 weeks. We are 33 weeks into this cycle. Meanwhile, the $787 billion stimulus bill being signed today and a $300 billion in consumer gas-cost savings will soon impact the recovery effort. Also, each economic recession ended with the emergence of a new economy requiring significant amounts of energy, reports E&Y. The firm advises planning for the upside.