Forum Moderators: skibum
Some people have great luck in areas which have little competition but may not be one of the traditional hot spots of affiliate marketing.
For specific programs contact the affiliate manager and ask them what sells the best.
You often hear whining from affiliates who found an item with a nice sales volume around a product's release date and then claim the merchant's reports must be wrong or they're being ripped off in some fashion because their sales falls off. A combination of being on the down side of that bell curve and more competition for the same item is often the answer they refuse to acknowledge. Then there's always the possibility that a new version had made the one they're selling obsolete too.
The bottom line is to know your products, know your market, and know your competition. It takes a lot of work, trail and error, and perseverance to make good money from affiliate marketing.
My most reliable sales have been from an online etailer that sells movies (not Amazon, they're waaaaaaaay below the radar). I get a quarterly report from them, telling me what sold, etc. From this I've found that the trend, if you can call it that, is basically whatever's newest sells the most.
Movies are definitely a fairly time-sensitive product. But reading that comment made me realise the obvious: not much isn't. Even perennial items like school clothes have a season when you can sell most of them. And most things in our houses become obsolete or go out of fashion to a fairly strict timetable.