When examining Warren Buffett's Berkshire Hathaway investment portfolio, it's hard to deny what his favorite stock is. With around 45% of the portfolio wrapped up in Apple (NASDAQ: AAPL) stock, it's pretty clear he prefers this company over others (especially considering the next-highest weight in his portfolio is 9%).

However, Apple just did something it hasn't done in seven years. The problem is, what it just did isn't a good thing; it's pretty bad. So is this business blunder Apple just experienced enough to knock it off its perch as the world's most valuable company and Warren Buffett's favorite? Read on to find out.

Apple, the maker of high-end technology like the iPhone, Apple Watch, iPad, MacBook, and more, is tied heavily to consumer sentiment. When the consumer is flush with cash, they are willing to spend increasingly more money on Apple's products. But Apple's sales struggle when funds tighten up, and the future isn't as rosy.

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Source Fool.com