Sony shares have moved up recently on rumors that the company might be bought by Apple. Apple could easily afford the deal. It has over $50 billion of cash on its balance sheet, and a market cap of $282 billion. Sony's market value is less than $34 billion.

Apple might like to own Sony's gaming operation, which manufactures and sells the PlayStation line of products. Apple does not have a position in the market, which is dominated by Sony, Microsoft, and Nintendo. The Apple App Store does offer online video games, but by industry estimates Apple only keeps one-third of the revenue from those and obviously has no hardware presence in the industry.

But, Sony is a very messy company, so Apple would probably have to dispose of some of the Japanese firm's businesses. Sony owns a large movie studio. Apple is in the content distribution business, and its content partners would probably not want to see Steve Jobs as a direct competitor.

Apple might be tempted to keep Sony's digital camera and TV screen business. It would have to suppose that the Apple brand would help sell the products at premium prices. There is, however, the problem that the two businesses have low margins and are in extremely competitive markets.

Sony has also been poorly managed, if operating profits and revenue growth are good measurements. Apple does not have the executive prowess to run a huge but unsuccessful company that is struggling. It would have nothing to do with Apple's strengths: product management and brand management.

Sony's best days are behind it. The company recently said it would stop making its Walkman cassette player for most of the world. That is a sign of how much power Sony has lost in the consumer electronics world. Even Apple would face a Herculean task if it wanted to revive Sony's fortunes.