This article from BBC makes it clear that predicting commodity prices is pretty hazardous. When oil was $150 per barrel, many oil producers even thought it was too high, yet there were plenty of people forecasting $200 oil at that point.
The fact is that no one know what the price will be. That’s what markets are for—to let supply and demand slug it out. The beauty of using relative strength in a systematic way is that it allows exposure in the portfolio when an asset is strong and trending, and removes it when it weakens. No forecasting required.
