Stocks
Stocks are microeconomic securities, rising and falling in
response to individual corporate results and prospects, while
currencies are essentially macroeconomic securities, fluctuating
in response to wider-ranging economic and political developments.
As such, there is little intuitive reason that stock
markets should be related to currencies. Long-term correlation
studies bear this out, with correlation coefficients of
essentially zero between the major USD pairs and U.S. equity
markets over the last five years.
The two markets occasionally intersect, though this is usually
only at the extremes and for very short periods. For example,
when equity market volatility reaches extraordinary levels
(say, the Standard & Poor’s loses 2+ percent in a day), the USD
may experience more pressure than it otherwise would — but
there’s no guarantee of that. The U.S. stock market may have
dropped on an unexpected hike in U.S. interest rates, while
the USD may rally on the surprise move.
Bonds
Fixed-income or bond markets have a more intuitive connection
to the forex market because they’re both heavily influenced
by interest rate expectations. However, short-term
market dynamics of supply and demand interrupt most
attempts to establish a viable link between the two markets
on a short-term basis. Sometimes the forex market reacts first
and fastest depending on shifts in interest rate expectations.
At other times, the bond market more accurately reflects
changes in interest rate expectations, with the forex market
later playing catch-up.
Overall, as currency traders, you definitely need to keep an
eye on the yields of the benchmark government bonds of the
major-currency countries to better monitor the expectations
of the interest rate market. Changes in relative interest rates
(interest rate differentials) exert a major influence on forex
markets.