Money Minute: Tyson Recalls Tainted Nuggets; Are Stocks Overpriced?

Tyson Foods (TSN) is recalling 75,000 pounds of chicken nuggets, after customers found small bits of plastic inside. No illnesses have been reported, but the company is advising that if you still have one of the contaminated five-pound bags in your freezer, throw it away. Call the company's toll free line, 800-328-3156, with any questions. The nuggets were sold at Sam's Club.

Stocks could be at a key turning point.

A number of Wall Street pros believe the market is in a dangerous position. After the Standard & Poor's 500 index (^GPSC) hit record highs last week, we saw a big sell-off on Friday despite some more good economic news.

Many of the stocks that ran up the fastest last year and earlier this year, have been taking a beating. Facebook (FB), Amazon.com (AMZN), Tesla Motors (TSLA) and a long list of other so-called momentum stocks have tumbled by 20 percent or more from their recent high. Many investors now see them as overvalued.

For the 5-year-old bull market to continue, these stocks will need to stabilize, and investors will have to rotate into a new group of favored stocks. %VIRTUAL-article-sponsoredlinks%Compounding the problem, a new earnings season begins tomorrow and any disappointments could lead to heavy selling.

Here on Wall Street last week, the Dow Jones industrial average (^DJI) gained 0.6 percent, coming within a whisker of the all-time closing high several times. The S&P 500 added 0.4 percent, but the Nasdaq composite (^IXIC) fell 0.7 percent.

MasterCard (MA) has swiped a big account. Walmart's (WMT) co-branded credit card will switch to MasterCard, beginning this summer, ending a relationship with Discover Card (DFS). But if you have one of those Discover cards, don't worry -- they'll still work. And Walmart is still at war with Visa (V), the nation's largest credit card company. The retailer sued Visa last month, seeking more than $5 billion for allegedly violating anti-trust rules with its swipe fees.

-Produced by Drew Trachtenberg.