The rebuilding of Japan will require large amounts of basic materials. One such material is cement. Cement is used in virtually every type of large building or factory.

It might be helpful to look at some cement stocks. Here are just a few, along with their recent share prices:

• Lafarge Coppee (LFRGY): $14.00. One of the world's largest cement and gypsum manufacturers.

When you are in a hole, stop digging -- no expression better exemplifies the situation in Venezuela caused by Hugo Chavez and his government. Obviously, this is not something they understand, as the current administration keeps digging the Venezuelan economy into a deeper hole, intensified by its attempt to nationalize rigs owned by a U.S.-based company.

On Wednesday, Venezuelan Oil Minister Rafael Ramirez issued a statement that Petroleos de Venezuela SA, the state oil company, was going to nationalize 11 oil rigs owned by Helmerich & Payne, a Tulsa, Oklahoma-based drilling company.

"Given the stock market setback, the time to buy has come. So what is a global investor to do now? Where in the world do we go?" asks Vivian Lewis.

The editor of Global Investing reviews five global investment ideas: Mexico's Cemex (CX), Canada's Cameco (CCJ), Greece's Coca Cola Hellenic (CCH), Israel's Teva Pharmaceutcial (TEVA), and India's ICICI Bank (IBN).

"I think this May correction has been the result of insane blind total panic in the wake of the still unexplained flash crash. Logically nothing explains the sell-off -- nada, nichevo, nichts, rien. To imagine that Greece is going to pull down Britain, Germany and France is simply ridiculous.

Happy Cinco de Mayo!

In celebration of the holiday, I thought it would be nice to remind investors not to forget about the opportunities in our southern neighbor. While Mexico is not a red hot emerging market like China or Brazil, there are still profits to be had there if you know where to look.

Here's why:

It is mind boggling that Hugo Chavez, the authoritarian President of Venezuela is racing towards a mock socialist political system when the two largest socialist regimes in the world, China and Russia, have done the opposite. Even our long standing communist adversary (now trading partner) Vietnam entered the 21st Century on a capitalist influenced spring loaded economic boom.

BusinessWeek reports in its latest edition that the Chavez government has been taking privately held supermarkets under government control:

Analyst upgrades:

• Deutsche Bank upgraded Cemex (NYSE: CX) to Buy from Hold on decreased dilution risk following the company's successful refinancing and raised its target on shares to $15 from $11.20.
• Rochdale upgraded Wal-Mart (NYSE: WMT) to Buy from Neutral and raised its target to $65. The firm is positive on Wal-Mart's defensive characteristics, cyclical upside, and competitive position.
• JPMorgan upgraded Gartner Group (NYSE: IT) to Overweight from Neutral to reflect stabilization in IT industry spending and the stock's attractive valuation. The firm has a $23 price target on the stock.
• Cavium Networks (NASDAQ: CAVM) was upgraded to Overweight from Equal Weight at Barclays.
• Borg-Warner (NYSE: BWA) was upgraded to Buy from Neutral at BofA/Merrill.
• Nanometrics (NASDAQ: NANO) was upgraded to Outperform from Perform at Oppenheimer.

Analyst upgrades:

• Bernstein upgraded Amgen (NASDAQ: AMGN) to Outperform from Market Perform on valuation as it believes threats to the core business are priced in at current levels and upside catalysts may come from pipeline news. The firm raised its target on shares to $65 from $57.
• Stephens upgraded CyberSource (NASDAQ: CYBS) to Overweight from Equal Weight on valuation as it believes the recent pullback creates a buying opportunity. The firm raised its target on shares to $16 from $14.
• JPMorgan upgraded Magna (NYSE: MGA) and Tenneco (NYSE: TEN) to Overweight from Neutral on expectations global auto production has sequentially bottomed with European light vehicle production rebounding in Q2. The firm also sees a short-term trading opportunity in TRW Automotive (NYSE: TRW), but keeps a Neutral rating on the stock.
• SINA Corp. (NASDAQ: SINA) was upgraded to Conviction Buy from Buy at Goldman.
• Cogent Communications (NASDAQ: CCOI) was raised to Buy from Hold at Citigroup.

What goes around comes around... and Hugo Chavez, the Venezuelan "socialist" president who keeps promoting perpetual referendums to stay in power, has turned his recent attention back to those capitalist dogs he despises so much to bail him out of a tight jam.

After nationalizing agriculture, mining, power and building materials companies over the past few years, which pushed capital flight, Venezuela was reliant on oil for about 93 percent of its export revenue in 2008, up from 69 percent in 1998 when Mr. Chávez was first elected, according to a story in the NY Times.

While the socialist (authoritarian) in him is unhappy as oil is now trading around $35 a barrel today, dealing a severe blow to his misguided notions of economics, the pragmatic side of the former military man is biting his tongue and reaching out to all the major international oil companies he chased off only a short while ago. He is asking them to return and invest to expand exploration, maintain and modernize current facilities and improve over all productivity.

The question is: On what basis would a foreign enterprise dedicate its financial and technical resources to an agreement with a partner that has already ignored previous agreements?

Exxon Mobil (NYSE: XOM) and CEMEX S. A. B. (NYSE: CX) are currently in litigation with the Chavez government. The Chinese and their nationally integrated oil companies have not done well either and remain apprehensive.

How can any deal get done? If it was being done on a smaller scale, you might use third party escrow accounts and ask for money to be set aside in advance, but Venezuela is cash strapped and would find this difficult to do.

One metaphor begets another, so from "what goes around comes around" I end with: Mr. Chavez, we would be happy to come back, but first we will have to see "cash on the barrel-head!"

Sheldon Liber is the CEO of a small private investment company and the principal for design and research at an architecture & planning firm. He writes the columns Chasing Value and Serious Money. DISCLOSURE: I own shares of CX but not XOM .

Analyst upgrades:

• Axys Tech (NASDAQ: AXYS) was upgraded to Outperform from Market Perform at Morgan Keegan on valuation.
  
• Credit Suisse upgraded Cemex (NYSE: CX) to Neutral from Underperform following the company's refinancing announcement.
  
• Patni Computer (NYSE: PTI) was upgraded to Buy from Neutral at UBS.

Analyst downgrades:

• Merriman downgraded Environmental Power (NASDAQ: EPG) to Neutral from Buy citing a lack of visibility into the company's capital raise and lowered their estimates to reflect a slippage in project schedules.
  
• Jefferies cut inVentiv Health (NASDAQ: VTIV) to Hold from Buy as they believe budget cuts at the company's client base make 2009 estimates too high. The firm lowered their target to $11 from $15.
  
• Oppenheimer downgraded RSC Holdings (NYSE: RRR) to Perform from Outperform to reflect the continued deterioration in non-residential construction and valuation following the recent rally.
• Smurfit-Stone (NASDAQ: SSCC) was lowered to Hold from Buy at Deutsche Bank.
  
• Distribucion Y Servicio (NYSE: DYS) was downgraded to Sell from Hold at Deutsche Bank.
  
• Key Energy (NYSE: KEG) was downgraded at SMH Capital to Neutral from Accumulate.

Analyst initiations:

• AECOM Technology (NYSE: ACM) was initiated with an Outperform rating and $34 target at Baird. The firm is positive on AECOM's diverse portfolio of services and global reach.
  
• Baird also initiated Checkpoint (NYSE: CKP) with a Neutral rating and $11 target, citing the weak macro environment.
  
• Thomas Weisel said Integra LifeSciences (NASDAQ: IART) has little exposure to economically sensitive areas of healthcare and has a varied mix of products that provide a platform for sustainable organic growth. Shares were initiated with an Overweight rating.
• Piper Jaffray assumed CBS Corp (NYSE: CBS) with a Neutral rating.
  
• BioMarin (NASDAQ: BMRN) was started at Stanford with a Hold rating.
  
• Websense (NASDAQ: WBSN) was initiated with an Equal Weight at First Analysis.

This post is part of a special report, A Dozen Ways to Play an Obama Building Boom.

"I think we have bottomed in some sectors, including commodities and materials," explains Glenn Rogers. In Internet Wealth Builder, he explains, "President-elect Obama has said he will pour hundreds of billions into projects.

"The Chinese and the Europeans have also committed to huge amounts to infrastructure spending." Here, he looks at one play on this trend -- Cemex (NYSE: CX).

"If you want to venture back into the stock market at this point and you're a long-term investor, my advice is to buy high-quality names with low P/E ratios, no debt coming due next year, and the sustainable ability to pay a dividend.

"Late last month, this Mexican cement giant traded as low as $4.01. Then President-elect Obama announced his plan to spend billions on infrastructure projects and guess what happened?

"The share price shot up on the expectation that infrastructure spending will translate into a growing demand for cement.

"Cemex shares traded as high as $11.35 before pulling back to close the week at $8.16. That's still more than double the November low but this is a stock that was trading at over $30 last June so it still looks like good value at this level.

Analyst upgrades:

• Jefferies upgraded Legg Mason (NYSE: LM) to Buy from Hold on valuation following the recent sell-off, as they find the risk/reward attractive at current levels. However, the firm lowered their target to $23 from $44.
  
• Merriman raised First Solar (NASDAQ: FSLR) to Buy from Neutral after the company showed "industry leading growth" in Q3. The firm has a 12-month price target range of $185 to $195 per share.
• Ladenburg upgraded KeyCorp (NYSE: KEY) to Buy from Neutral.
• Citigroup upgraded shares of Silicon Laboratories (NASDAQ: SLAB) to Buy from Hold on valuation and expects the company to post above average industry growth in 2009.
• Janus Capital (NYSE: JNS) was upgraded to Neutral from Underweight at JP Morgan.
  
• Associated Estates Realty (NYSE: AEC) was upgraded to Outperform from Neutral at Baird.
  

Analyst downgrades:

Analyst upgrades:

• Baird upgraded Bank of America (NYSE: BAC) to Outperform from Neutral citing valuation and long-term earnings power.
• Keefe Bruyette upgraded shares of Nationwide Financial (NYSE: NFS) to Outperform from Market Perform as it believes the deal is not at risk and will close at the agreed upon $52.25 price.
  
• Friedman Billings upgraded American Eagle (NYSE: AEO) to Outperform from Market Perform citing valuation.
• Eli Lilly (NYSE: LLY) was upgraded to Hold from Sell at Natixis.
• W.W. Grainger (NYSE: GWW) was upgraded to Outperform from Neutral at RW Baird.
• Fidelity National (NYSE: FIS) was upgraded to Buy from Neutral at SunTrust.

Analyst downgrades:

• Credit Suisse downgraded Eli Lilly NYSE:(LLY) to Neutral from Outperform citing the increased risk profile from the ImClone (IMCL) deal.
• Soleil downgraded Google (NASDAQ:GOOG) to Hold from Buy as it believes Google's cost management may lag revenue weakness and that the falling stock price implies employee defections. The firm lowered its target to $350 from $580.
• Piper downgraded shares of Orbitz (NYSE:OWW) to Sell from Neutral to reflect deteriorating travel industry fundamentals and the company's levered balance sheet.
  
• US Steel (NYSE:X) was downgraded to Neutral from Buy at Goldman.
• Philips Electronics (NYSE:PHG) was downgraded to Hold from Buy at ING Group.
• Lamar Advertising (NASDAQ:LAMR) was downgraded to Hold from Buy at Soleil.
• Cemex (NYSE:CX) was downgraded to Hold from Buy at Citigroup.
  

Analyst initiations:

• Bidz.com (NASDAQ:BIDZ), American Superconductor (NASDAQ:AMSC) and Union Bankshares (NASDAQ:UBSH) were today's noteworthy initiations:
  
• Bidz.com (NASDAQ:BIDZ) was initiated with a Hold at Stamford, as the firm does not want to recommend a company that has never been tested during difficult economic times, but is positive on BIDZ's growth potential.
• American Superconductor (NASDAQ:AMSC) was initiated with a Hold at Stanford, as the firm believes the Euro decline and global market turmoil are near-term risks.
• Union Bankshares (NASDAQ:UBSH) was initiated with an Underperform at RBC Capital, as the firm views shares as overvalued.
• Regis Corp (NYSE:RGS) was initiated with a Neutral at RW Baird.
• CommVault's (NASDAQ:CVLT) coverage was resumed with a Neutral at Merrill Lynch.

In the margins of Barron's this week there was a smallish note about the government of Venezuela nationalizing Cemex's (NYSE: CX) operations in that country. For some reason the government of Hugo Chavez thinks that stealing all of the private companies in 'his' country will lead to greater prosperity for 'his' people.

While it is a long journey from Venezuela to Zimbabwe, with its exponential inflation rate and a near-total economic breakdown, every journey begins with a first step. Mr. Chavez will move much closer to this inevitable outcome if he continues on his chosen path.

Motley Fool has a good write-up on the subject in which they detail the sour relations between Chavez and foreign businesses. Chavez recently offered to re-open negotiations with Cemex, but since he has already decided to take the company, that offer is suspect -- you can't negotiate with a gun pointing at you. To date, Chavez has nationalized the telecommunications industry, electricity, and oil. How many steps down the road is that? Why would anyone want to invest in Venezuela?

MOST NOTEWORTHY: Shanda Interactive, Evergreen Solar, SunPower and Marriott were today's noteworthy downgrades:

• Citigroup downgraded shares of Shanda Interactive (NASDAQ:SNDA) to Hold from Buy following the company's lower-than-expected guidance as they see a lack of positive catalysts.
  
• Merrill downgraded Evergreen Solar (NASDAQ:ESLR) and SunPower (NASDAQ:SPWR) to Sell from Neutral citing a potential reduction in German tariffs.
  
• Morgan Stanley downgraded Marriott (NYSE:MAR) to Equal Weight from Overweight citing economic pressures on business travel.

OTHER DOWNGRADES:

• Vivus (NASDAQ:VVUS) was downgraded at Wachovia to Market Perform from Outperform.
  
• UBS lowered Juniper(NASDAQ:JNPR) to Neutral from Buy.
  
• Cemex (NYSE:CX) was downgraded to Neutral from Overweight at JP Morgan.

It is alarming to me that the same people who screw up the economy (or stand by watching) are the ones that are now promoting the remedies. They have proven without a shadow of a doubt that this is not their strong suit. The proposed economic stimulus package has bi-partisan support and calls for an estimated $156 billion of tax rebates ranging from $500 to $1,000 (+ $300 for each child) that might show up in May.

If we are going to add on to our already humungous joke of national debt, than I want to invest this capital in something that will bring a higher return on invested capital (ROIC) than the paltry one time mad money. That expenditure should be for national infrastructure projects like roadways, bridges, tunnels, and waterways.

We have all heard about the poor condition of our national infrastructure and the hundreds of billions of dollars of repair work and replacement that is desperately needed.

This alternative would bring visible results that every single person in the country would benefit from and improved linkages always stimulate economic growth. Road improvements even reduce fuel consumption by shortening routes and reducing friction both strategically and physically.