The markets are an ever-changing depiction of a country's strength against another. As the strength of a currency rises and falls, some traders will prosper while others will lose their profits previously gained. While these changes will at times be unfavorable for a country, they can also be unfavorable for a trader. Depending on your trading style, what is “unfavorable” will change. This is one reason Apiary Fund teaches a variety of styles: so that when it's unfavorable for your trading, you can try a different setup and hope to make profits from that.
Do shifting spreads keep you guessing?
Entering and exiting trades at the right time is critical. It is easy to spot trade set ups looking back at the charts, but seeing the whole picture forming before you can be quite a bit more difficult.