The Tricky Relationship Between Stocks and Forex
One challenge with using global stock markets to guide your forex trades is figuring out who’s influencing who.
It’s a bit like asking, “Which came first, the chicken or the egg?” Or, “Who’s really in charge here?”
Stocks vs. Forex: Who Leads?
So, do equity markets steer currency movements? Or is the forex market the real decision-maker?
The general theory goes like this:
When a country’s stock market is performing well, investor confidence in that country increases. As foreign investors rush to buy into the rising market, they first need to exchange their own currency for the local one — creating demand that boosts the local currency’s value.
But when the stock market takes a hit, confidence drops, and investors pull their money out — exchanging the local currency back to their own, which can weaken the domestic currency.
Sounds straightforward, right? Well, not always.
Reality Check: It’s Complicated
Take the U.S. dollar and the S&P 500, for example. Their relationship over the past 20 years has been inconsistent. Sometimes they move together, sometimes they move in opposite directions, and occasionally, there’s no clear relationship at all.
This doesn’t mean the connection is useless. It just means you need to be aware of when the correlation is working — whether positively or negatively — and when it’s not.
A Global Example: U.S. and Japan
Let’s look at how the stock markets and currencies of the U.S. and Japan behave.
Oddly enough, strong economic data from either country often puts downward pressure on their own currencies — the dollar and the yen.
Now check out the correlation between the Dow Jones Industrial Average (U.S.) and the Nikkei 225 (Japan). Since the early 2000s, these two indices have generally moved in sync — rising and falling together, like two dance partners in step.
Sometimes one leads the move, and the other follows. Not every time, but often enough to suggest that global equity markets tend to move in the same general direction.