U.S. dollar strength means that the dollar's value is high relative to other currencies compared to the past. This means one of ... A strong dollar can also mean that the dollar rate increased over a short period. ... Therefore, whatever makes the euro weaker will make the dollar stronger and vice-versa. read more
Since all currencies that are currently in use are fiat currencies; the stregnth of the currency depends on the strength and the faith users give to the government and country which prints this currency. read more
Only 6 of 55 international currencies are stronger than the dollar, as of February 2016. Euro (0.9 EUR to 1 USD) In January 2016, the monthly average for the dollar to euro exchange rate was about €0.92 for $1. read more
So demand for U.S. dollars goes up relative to other currencies, and the U.S. dollar gets stronger. But there's another wrinkle that suggests a strong dollar may be bad. A strong U.S. dollar means Americans can buy more stuff from other countries. read more