Yesterday, I gave you five reasons I think it's best to take your money and walk away in May. Macroeconomic weakness and history continue to serve up warning signs to investors -- if they're willing to listen, that is.

Today, I'm going to discuss my other five factors that have influenced me to holster my buying for the time being and simply walk away in May. (For reference, here are my first five reasons.)

6. Retail sales are weakening
Blaming the weather can only take you so far; for the retail sector, the buck stopped in April.

Retailers, for months, have benefited from significantly warmer-than-normal weather in parts of the United States and an early Easter holiday. Last year, retailers' earnings were slammed because of a particularly nasty winter that kept consumers holed up in their homes instead out shopping. This year, consumers have returned with a vengeance, but the comparisons these retailers are up against aren't really comparable with last year. Based on April's same-store-sales figures for some of the nation's largest retailers, we're finally beginning to see those expectations come back to Earth.

Macy's (NYSE: M) and Costco (Nasdaq: COST) both reported same-store-sale increases over the year-ago period of 1.2% and 4%. These figures, however, fell shy of Wall Street's expectations for 1.9% and 4.9% -- the second consecutive monthly shortfall for Costco, which has seen consumer transactions growth slowing. Weak retail figures are a warning shot from a retail sector that still isn't on stable footing yet.

7. Bank growth has stalled
The third round of stress tests conducted by the Federal Reserve went more smoothly than planned, with only four major banks, including Citigroup (NYSE: C), failing the test and many banks coming out better capitalized than many had suspected.

But recent bank earnings reports have also shed light on another factor: While the financial sector largely led us out of our lows this year, they're also struggling to find avenues of growth. JPMorgan Chase (NYSE: JPM) was caught with its pants down last week after a derivatives trading unit lost the company $2 billion over a span of just six weeks. The derivatives were meant to act as a risk hedge against JPMorgan's own investments but actually wound up exacerbating its risks instead.

With numerous banks still facing mortgage-related lawsuits and litigation, and countless homeowners well behind on their payments, the sector is facing a huge void in terms of near-term growth opportunities.

8. Wage growth being outpaced by inflation
It isn't hard to understand why retail spending is challenged, or why home prices are weakening, or even why consumers are having a hard time keeping up with their mortgage payments when you realize that we're in an extended period of inflation levels outpacing U.S. wage growth.

G

Sources: Bureau of Labor Statistics, InflationData.com, author's calculations.

I can't emphasize enough that this poses a very, very big problem! If the cost of goods, including fuel, which does have a tendency to inflate prices higher, continues to outpace wage growth, it would be unlikely that we'd see any sustainable (key word there) increase in consumer spending. With the U.S. economy so brutally dependent on consumer spending to drive growth, it's no wonder the Federal Reserve is bent on bringing the inflation rate down to 2% -- a level that also happens to be the average wage growth witnessed over the past year. The two rates are converging, but not enough for my tastes.

9. Asia is slowing
GDP growth of 7.5% would be considered potentially the greatest boom in U.S. history. For China, it's a significant slowdown from the double-digit growth rate that its residents and the rest of the world have become accustomed to. With slowing growth confirmed by China's premier, Wen Jiabao, in March, the as of now unanswered question then becomes: Who will put the weight of the world on its shoulders if not China?

We're already beginning to see the negative effects of a Chinese slowdown affecting precious metals. Gold and silver are trading at multimonth lows, and the miners are finding themselves in even worse shape, since many were lagging in terms of performance to their underlying metal to begin with. In its latest report, Freeport-McMoRan Copper & Gold (NYSE: FCX), China's largest supplier of copper, sold roughly 100 million fewer pounds of copper and more than 190,000 fewer ounces of gold than in the comparable quarter last year.

This story could be superimposed with just about any other metals company that supplies China with everything from precious metals to steel. The slowdown has been confirmed; now who's going to step up to fill China's void?

10. History tells us to walk away
To expound further on research by the Fool's Alex Dumortier, history has been a very good indicator of future results.

As Alex pointed out in his research, buy-and-hold investing outpaced a strategy that involved trying to time the market by selling in May and rebuying in October -- not by much, but enough to be statistically significant. However, his research also indicated that a strategy of purchasing in October and holding for seven months as opposed to purchasing in May and holding for months would have produced a 73-fold outperformance!

What we can infer from this, as an addendum to Alex's thesis, is that long-term investing does indeed produce better results, but avoiding making purchases in May could be another key factor to producing solid results. There's nothing that says you have to sell in May, but there is statistical evidence that buying in May has not produced as good of a return had you purchased later in the year, when the historical returns were higher.

My buying boycott
There you have it -- 10 reasons I'm too worried to put any money to work in this market at the moment. That doesn't mean there aren't great values or that I won't nibble here and there on some of my core investments, but let's be clear that I'm saving my cash for purchases later in the year, when some of these issues addressed here have been resolved.

Agree? Disagree? Tell me about it in the comments section below.

Now may not be the best time to buy, but these three stocks could be your ticket to a stable retirement. See what stocks our analysts think could help you retire rich ... for free! Get our latest special report.