The spike in volatility was easy enough to understand. Basically, the possibility of a default by a member of the EU or even worse, a breakup of the Euro created massive uncertainty in the markets, spurring the flow of capital from regions and assets perceived as risky to those perceived as safe havens. As you can see from the chart below, this trend has begun to reverse itself, but still remains prone to sudden spikes.

While the crisis in the EU seems to have (temporarily) settled, investors are attuned to the possibility that it could flare up again at any moment. A failed bond issue, a higher-than-forecast budget deficit, political stalemate, labor strikes – all signal a failure to resolve the crisis, and would surely trigger a renewed upswing in volatility and sell-off in risky assets.

The same goes for (unforeseen) crises in other regions, affecting other currencies. Muses one analyst: “Next week? Who knows. One strong candidate is for flight out of the yen as investors start to fear there won’t be enough domestic demand for mountains of Japanese debt and foreign buyers will insist on much higher yields. Another might be that Swiss banking exposure to insolvent east European households causes another banking crisis.” Don’t forget about the UK and US, both of which have hardly put the recession behind them, and whose Trillions in debt represent powder kegs waiting to explode.

It will be months or years before these latent crises even begin to manifest themselves, let alone achieve some kind of resolution. As a result, many analysts predict that volatility will remain high for the foreseeable future: “Big and sudden currency market moves shouldn’t come as a surprise, whatever the direction…Higher market volatility should follow on from greater macroeconomic volatility. Increased economic fluctuations increase uncertainty. And there’s no question macroeconomic volatility has risen.”

In addition, there is no way for governments for Central Banks to alleviate these crises due to the “Trillema of International Finance.” Greg Mankiw, Harvard Economics Professors, explains that in prioritizing an independent monetary policy and open capital markets have forced many countries to forgo exchange rate stability: “Any American can easily invest abroad…and foreigners are free to buy stocks and bonds on domestic exchanges. Moreover, the Federal Reserve sets monetary policy to try to maintain full employment and price stability. But a result of this decision is volatility in the value of the dollar in foreign exchange markets.” While the Euro has eliminated exchange rate fluctuations between members of the Eurozone, meanwhile, there is nothing that the ECB can (or desires to) do to minimize volatility between the Euro and outside currencies.

From the standpoint of forex strategy, there are a couple of lessons that can be learned. First of all, the carry trade will remain underground until volatility returns to more attractive levels. Until then, the potential gains from earning a positive yield spread will be offset by the possibility of sudden, irascible currency depreciation. Second, growth currencies – despite boasting strong fundamentals – will remain vulnerable to sudden declines. That doesn’t mean that they should be avoided; rather, you should simply be aware that small corrections could easily turn into multi-month weakness.

Over the last month, the Chinese RMB has appreciated by slightly less than 1% against the Dollar, although most of that jump took place in the day that followed the June 19 announcement. After the initial excitement faded, a sense of disappointment set in as it became clear that China had no intention of allowing the RMB to appreciate rapidly: “The subsequent appreciation of the yuan against the dollar is likely to be small, perhaps just a few percent over the remainder of the year.” In fact, futures prices reflect only an additional 1.5% appreciation over the next 12 months.

 Due both to its slow speed and small scope, the revaluation could conceivably benefit the Chinese economy. That’s because in the short-term, a more expensive currency will mean higher prices paid for exports. The quantity of exports is unlikely to decline, such that total export revenues could actually increase. According to one analyst, “With Chinese imports, there are no substitutes in the short term. Maybe in 10 years, importers will have a choice, but right now they will just have to pay more. No other country…can build a manufacturing base and all the infrastructure that you need — transportation, energy, the entire value chain to the final good — takes many years.” As if on cue, China’s trade surplus expanded in June, in spite of the revaluation of the Yuan.

As a result, American manufacturers and other vested interests have announced that they will continue to lobbythe US government to pressure China on the currency issue, on the basis that the undervalued RMB is eroding both the US economy and the labor market. Argued the director of the Peterson Institute for International Economics, “The case for a substantial increase in the value of the renminbi is thus clear and overwhelming. An appreciation of 25% to 40% is needed to cut China’s global [account] surplus even to 3% to 4% of its GDP. This realignment would produce a reduction of $100 billion to $150 billion in the annual U.S. current account deficit.” It might also help to restore the estimated 1.4 million jobsthat have been lost due to China’s forex policy. According to analysts, however, political infighting make it unlikely that any new law or punitive tariffs will be imposed anytime soon.

At the very least, China will continue to make the Yuan more flexible, so that one day it can float freely. It has already moved to facilitate trade settlement in Yuan, and analysts expect ” ‘more than halfof China’s total trade flows, primarily bilateral trade with emerging markets, to be settled in renminbi in the next three to five years.’ ” China is also making it more attractive for foreign investors to hold Yuan, by loosening controls that govern Chinese capital markets and creating new investment vehicles that will cater directly to foreigners. In the mean time, holding RMB is pretty unattractive given both “the hassle of getting money in and out of China” and the low rates offered by Chinese money market funds.

As for the impact on the rest of the forex market, I think that commodity currencies and growth currencies could come out ahead. The move signals an implicit confidence in the global economic recovery and can perhaps be seen as a harbinger for high commodity prices: In addition, it will “provide a boostto U.S. exports, employment, earnings and growth, reinforcing the case for growth sustainability at a time when investors are more fearful than they were in April.” The US Dollar, on the other hand, could emerge as one of the big losers. Already, China’s forex reserve growth has slowed to the weakest pace in 11 years. This trend will probably continue, since smaller purchases of Dollars will be required to maintain the floating peg. In fact, the Euro’s recovery against the Dollar has coincided mysteriously with the revaluation of the Yuan. While this is probably just a coincidence, it is nonetheless symptomatic of a declining role for the Dollar as the world’s reserve currency. But that is a topic for another day…

To be sure, the new currencies from Down Under trade in virtual lockstep, having strayed by only a few cents in either direction from their trading mean over the last year. Since the beginning of May, however, the Kiwi has staged an impressive rally, rising 8% against the Aussie in a matter of weeks. Perhaps, there is something worth analyzing after all!

According to most analysts, the sudden rise is largely a product of risk-appetite. Specifically, as the EU sovereign debt crisis stalls, investors are relaxing, and gradually moving capital back into growth currencies, like the New Zealand Dollar. In fact, the Kiwi recently rose to a one-month high on the same day that Spain successfully completed a bond auction.

For proof of this phenomenon, one need look no further than the close relationship between the NZD/USD rate and US stocks, as proxied by the S&P 500. You can see from the chart below that they have largely tracked each other over the last 12 months. This relationship seems to have intensified over the last few weeks, as the New Zealand Dollar sometimes takes its cues directly from releases of US economic data.

However, New Zealand economic fundamentals are also playing a role, perhaps even the dominant role. According to one analyst, “The NZ dollar had now recovered nearly all its losses of late May…Domestic fundamentals had contributed relatively more to the NZ dollar’s recent recovery than had the mild improvement in the global backdrop.” Unlike Australia, which has been racked by political disruptions and concerns over an economic slowdown by its largest trade partner (China), New Zealand continues to coast at a healthy pace.

Moody’s forecasts that New Zealand’s economy will expand by 2.4% in 2010, and “assuming a healthy global economy, New Zealand’s recovery should evolve into a self-sustaining expansion during 2011 and 2012.” This should set the stage for near-term rate hikes, beginning with an expected 25 basis point hike on July 29. Analysts project that the benchmark rate will reach 3.75% by the end of 2010, and 5% in 2011. Widening interest rate differentials, combined with the ongoing recovery in risk appetite, could turn the Kiwi into a popular carry trade currency.

Given that the Central Bank of Australia is also projected to further hike rates, it seems the Aussie will join the Kiwi in its upward march, and that the two currencies will continue to trade in lockstep. Options traders might try to construct a low volatility strategy, such as a short straddle or selling covered calls against the pair. For currency traders that prefer the Aussie, meanwhile, the New Zealand Dollar could serve as an attractive hedge.

Then again, it’s possible that both currencies could fade, especially if the EU debt crisis intensifies, and/or the global economic recovery stalls. In short, “The near-term outlook is…uncertain due to prevailing risk aversion that may weigh on the commodity currency universe.”