The problem with having enough cash on your balance sheet to bail out a medium-sized country is that everyone has a use for it. Last week, China Mobile revealed some loose change from its $30 billion-plus cash pile would be used to buy a 20% stake in Shanghai Pudong Development Bank.It might have been only a $5 billion investment, or just 3% of China Mobile’s(HK:941 73.95, +1.00, +1.37%) (CHL 47.65, +0.25, +0.53%) market cap, but investor reaction was brutal, wiping over $10 billion off its total capitalization.Rather than try to piece together what was happening as the news dripped out, investors hit the sell button. The stock, the largest Hang Seng Index constituent by market cap, was 6% down on the week.

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