One of the most difficult things to do is to try and determine the future level of economic growth. There are so many variables that go into the level of economic growth that no model can accurately predict the exact level.
What we can do is look for signs of economic growth, or a lack thereof, and create an investment strategy based on these indications. Looking backward won't help; we need to look forward.
One method that can help is to see what the professional investors are doing, as they are on the cutting edge when it comes to creating a profitable investment strategy.
Last week saw two distinctly different moves by professional traders. The first was that hedge funds made a massive trade against copper. With global inventories piling up, professionals have an investment strategy that will benefit from the price of copper if it drops.