If anything, the company should be sitting pretty, with 60 percent of its goods coming from Brazil, whose currency has weakened against the dollar.

Thus, if China's currency weakened, its economy appeared to shrink.

The Mexican currency immediately weakened to as much as 2,700 to buy and 3,000 to sell.

That does not mean the currency will not weaken.

"For the next few weeks at least, people will be looking for opportunities to buy dollars when the currency weakens."

Both companies derive about 70 percent of their sales abroad, and that revenue is worth more in dollars if the currency weakens.

Despite reports of the planned effort, the Mexican currency weakened for the fifth day against the dollar.

The currency, the real, has weakened by nearly 10 percent against the dollar in the last two months.

A perfect prescription, by anyone's standard, for a currency to weaken.

A currency can also weaken because a nation's interest rates are lower.