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Facebook buying WhatsApp for 19 Billion. How are existing shareholders affected?
Of course it is a dilution of existing shareholders. When you buy milk in the supermarket - don't you feel your wallet diluted a little? You give some $$$ you get milk in return. You give some shares, you get Watsapp in return. That's why such purchases must go through certain process of approval - board of directors (shareholders' representatives) must approve it, and in some cases (don't know if in this particular) - the whole body of the shareholders vote on the deal.