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At what price are dividends re-invested?
If a stock is trading for $11 per share just before a $1 per share dividend is declared, then the share price drops to $10 per share immediately following the declaration. If you owned 100 shares (valued at $1100) before the dividend was declared, then you still own 100 shares (now valued at $1000). Generally, if the dividend is paid today, only the owners of shares as of yesterday evening (or the day before maybe) get paid the dividend. If you bought those 100 shares only this morning, the dividend gets paid to the seller (who owned the stock until yesterday evening), not to you. You just "bought a dividend:" paying $1100 for 100 shares that are worth only $1000 at the end of the day, whereas if you had just been a little less eager to purchase right now, you could have bought those 100 shares for only $1000. But, looking at the bright side, if you bought the shares earlier than yesterday, you get paid the dividend.  So, assuming that you bought the shares in timely fashion, your holdings just lost value and are worth only $1000.  What you do have is the promise that in a couple of days time, you will be paid $100 as the dividend, thus restoring the asset value back to what it was earlier.  Now, if you had asked your broker to re-invest the dividend back into the same stock, then, assuming that the stock price did not change in the interim due to normal market fluctuations, you would get another 10 shares for that $100 dividend making the value of your investment $1100 again (110 shares at $10 each), exactly what it was before the dividend was paid. If you didn't choose to reinvest the dividend, you would still have the 100 shares (worth $1000) plus $100 cash. So, regardless of what other investors choose to do, your asset value does not change as a result of the dividend.  What does change is your net worth because that dividend amount is taxable (regardless of whether you chose to reinvest or not) and so your (tax) liability just increased.