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How can one protect oneself from a dividend stock with decreasing price?
A specific strategy to make money on a potentially moderately decreasing stock price on a dividend paying stock is to write covered calls.  There is a category on Money.SE about covered call writing, but in summary, a covered call is a contract to sell the shares at a set price within a defined time range; you gain a premium (called the time value) which, when I've done it, can be up to an additional 1%-3% return on the position.  With this strategy you're collecting dividends and come out with the best return if the stock price stays in the middle: if the price does not shoot up high enough that your option is called, you still own the stock and made extra return; if the price drops moderately, you may still be positive.