Source: Jatrophatrends
What makes the existence of trends possible, you ask?
From Ivanhoff:
At the foundation of every major price trend there is either an improvement in fundamentals or (as it is in most cases) rising expectations for future improvement in fundamentals. From a bird’s eye view major changes in expectations for fundamentals are based on new social trends, business cycle, economic cycle or new regulations – all of them are sustainable sources of change and don’t just disappear overnight. This is what makes the existence of trends possible.
Momentum then becomes an effective means of capitalizing on those trends.
Momentum investing is based on the premise that past price performance is a good indicator of future price performance. Stocks with the highest relative strength over the past 3-12 months often remain among the best price performers over the next 3-12 months. The central idea behind this investment approach is to find an already existing price trend and a proper point of entry.