The first chart below is of SPDR S&P MidCap 400 over iShares S&P Index , which measures strength of mid-cap stocks relative to large caps in the S&P 500. As smaller-cap stocks outperform larger ones, represented by upward price movement in the chart below, investor sentiment tends to be strong.
Since mid-May, this pair has trended lower, signaling that investors were favoring large-cap stocks and positioning portfolios defensively. The Fed's announcement last week brought this pair down to yearly lows.
As markets have stabilized, realizing that dire predictions of market weakness may be overstated, the price action has rebounded higher.
Many equity investors waited on the sidelines looking for more clarity about U.S. monetary policy and for a pullback after a long run-up in equities. Now, after the pullback, those investors are looking to be put money back in the markets.
The next chart is of SPDR S&P 500 over iShares MSCI Germany Index , which measures the relative strength of U.S. equities versus German equities. Germany is perceived as the strongest European economy and thus is a good indicator of strength in the more industrial economies of Europe.
The U.S. economy showed more improvement than European economies through much of 2013. That led to U.S. equities outperforming their European counterparts and to a stronger dollar versus euro. The pair below correlates strongly to movements in the euro/dollar currency cross and is thus a good predictor of currency market movements.
As U.S. monetary policy came into question in late April/early May, this trend began to reverse. The U.S. dollar weakened and European assets, led by the German economy, began to outperform world equity markets.
The chart's price action this year has boiled down to economic outlook and clarity of central bank policy. The Fed's explicit plan for monetary tightening signaled U.S. dollar strength over the long term.
Equity markets across the world fell, but U.S. equities showed strength versus German equities, and European developed economies as a whole. Due to a relatively better economic outlook for the U.S. for the rest of this year, expect U.S. assets to outperform Europe's.
The last chart is of PowerShares DB US Dollar Index Bullish over CurrencyShares Japanese Yen Trust . The yen is a safe-haven currency that attracts buyers in times of global economic uncertainty.
The Bank of Japan has aggressively weakened the yen for the better part of this year, but uncertainty over the future of U.S. stimulus brought strength back to the yen. That rattled all asset markets and weighed on commodities priced in U.S. dollars.
Fed Chairman Ben Bernanke announced at the June Fed meeting that monetary stimulus was coming to an end, which meant Japanese monetary policy instantly became the more accommodative of the two. Although riskier assets across the globe sold off, the yen weakened versus the dollar based on the difference in monetary policies.
Look for the yen to weaken further as asset markets begin to stabilize and the U.S. dollar pushes higher.
At the time of publication the author had no position in any of the stocks mentioned.
This article is commentary by an independent contributor, separate from TheStreet's regular news coverage.