I want to do some stock photography and I'd like to maximize the results of my efforts. What subjects and topics are the best ones to take pictures of -- the ones that are the most requested and the most downloaded? Maybe the ones with the highest demand and the lowest supply?

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The one's with the highest demand are sure to be the one's with the highest supply. As a result, you have to be very good at them. I don't do stock, I'm not prolific enough for that.

Use the link to access a list of what is needed and not needed.... this is only for the one site, but I'm sure that a lot of stock sites are about the same. I personally use this site, and its really nice actually. http://www.istockphoto.com/tutorial_5.0_neededfiles.php

it goes by what is in demand or the market calls for.....now it would be political stuff, things dealing with money and the economy, gas.......news and current events drive the stock photo market