You answered my question with an equities example, I specifically asked about currency. I understand backward looks at charts to see a trend. I want to know why you think you know what drives or trends the currency market, or the bond market (if you want to go for that one).
If you want to know about trends, don't complicate the matter. Find a gauge of some kind, 20 day moving average, 55 day moving average, chart trendlines, etc.
Trend following is the simplest successful investment technique there is. But simplicity is not the same as lack of difficulty. The psychology of trend following is difficult. You'll be buying ridiculously high prices and selling ridiculous low ones, feeling like an idiot at times and losing a lot of money being whipsawed.
BTW, the currencies are some of the best trending markets out there.