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NEW YORK (ETF Expert) --The city of Detroit just filed for the largest municipal bankruptcy in U.S. history. Crude oil is pushing $110 per barrel. Microsoft (MSFT) - Get Microsoft Corporation Report, eBay (EBAY) - Get eBay Inc. Report, Intel (INTC) - Get Intel Corporation Report and Google (GOOG) - Get Alphabet Inc. Class C Report severely disappointed in their second-quarter earnings reports.

Housing starts dropped to its slowest pace in 10 months. Also, while it may appear unlikely to market watchers, the

Federal Reserve

may still taper its bond purchasing program earlier than anticipated.

Less money for retirees, less consumption due to the gas pump, lower sales by bellwether corporations, fewer homes being constructed and less borrowing due to elevated interest rates. Is this the stuff that stock market rallies thrive upon? Apparently so.

Yet, the remarkable run-up may be running out of time. One of Warren Buffett's favorite indicators of over-the-moon stock prices is the ratio of total market capitalization to gross domestic product.

According to CNBC,

the net ratio stands at 118%. Previous moments in history when the ratio exceeded 100% include 1999 and 2007 -- right before humongous stock bears mauled the

S&P 500

and slashed its value in half.

Nevertheless, this Fed-fueled uptrend has defied analyst criticism and brushed aside guru bearishness for years.

Famous doom-n-gloomers

from Roubini to Rosenberg have found themselves waving the white flag. Meanwhile, perma-bulls are expecting the S&P 500 to gain at least another 10%-15% by year's end.

Personally, I am

playing it relatively safe with my client allocation to equities.

That said, there are at least three solid reasons why irrational enthusiasm may "win out" for a while longer.

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1. Underperforming institutional dollars.

Hedge funds and most institutional advisers have struggled to keep pace with U.S. stocks; any effort to diversify or hedge with competing assets (e.g., commodities, currencies, foreign stocks, foreign bonds, domestic bonds, etc.) have only dragged on portfolio performance.

It follows that in a "what-have-you-done-for-me-lately" investing arena, the pressure to perform has resulted in limited diversification and greater ownership of U.S. equities.

2. Political necessity.

Due to the Federal Reserve's manipulation of interest rates, corporations have been able to restructure debt and buy back shares of stock; consumers have been able to purchase big ticket items like residences and automobiles.

Meanwhile, the subsequent wealth effect associated with rising home prices and rising 401k values is something that President Obama's political party wants to see continue. It follows that Fed flexibility on tightening does not mesh with the reality that the President will choose a stimulus-favoring replacement in January of 2014.

In that manner, the central bank would likely maintain the status quo through the mid-term elections in November of 2014, rather than do anything to upset the apple cart.

3. Global monetary stability.

Many have heard of the "Butterfly Effect." Simply put, when a butterfly flaps its wings in China, the breeze can be felt on a street corner in Manhattan. If there's one thing that the recent tapering debate demonstrated to members of the Federal Open Market Committee is that the U.S. cannot act independently of the rest of the globe. If the U.S. moves toward tightening, weak eurozone countries (e.g. Spain, Italy, Portugal, etc.) will see the rates on their sovereign debt reach unsustainable levels.

Unless the eurozone makes more significant progress in containing the debt debacle, the U.S. risks stoking the fires of debt contagion. In other words, unrestrained stimulus will be around for longer than many people think -- and that means irrational exuberance may be around for longer than the naysayers care to accept.

Again, there are scores of signs of an overvalued, overextended stock market. And yet, there are plenty of signs that the Fed-inspired stock bull will carry on, however wayward the reasoning.

For my part, I continue to stick with ETFs that exhibit less rate sensitivity and strong defensive attributes. I still hold large positions in vehicles including

SPDR Health Care Select Sector

(XLV) - Get Health Care Select Sector SPDR Fund Report

,

PowerShares Pharmaceuticals

(PJP) - Get Invesco Dynamic Pharmaceuticals ETF Report

and

Market Vectors Retail

(RTH) - Get VanEck Retail ETF Report

. I believe in defensive ETFs such as

iShares DJ Aerospace & Defense

(ITA) - Get iShares U.S. Aerospace & Defense ETF Report

and view

Boeing

(BA) - Get Boeing Company Report

uncertainty as opportunity. Dividend growth via

Vanguard Dividend Growth

(VIG) - Get Vanguard Dividend Appreciation ETF Report

(VIG) or an allegiance to dividend aristocrats via

SPDR S&P Dividend

(SDY) - Get SPDR S&P Dividend ETF Report

is also desirable. These ETFs are likely to be less rate-sensitive than higher-yielding dividend funds.

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This article was written by an independent contributor, separate from TheStreet's regular news coverage.

Disclosure Statement: ETF Expert is a website that makes the world of ETFs easier to understand. Gary Gordon, Pacific Park Financial and/or its clients may hold positions in ETFs, mutual funds and investment assets mentioned. The commentary does not constitute individualized investment advice. The opinions offered are not personalized recommendations to buy, sell or hold securities. At times, issuers of exchange-traded products compensate Pacific Park Financial or its subsidiaries for advertising at the ETF Expert website. ETF Expert content is created independently of any advertising relationships. You may review additional ETF Expert at the site.

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