The Auction House is something that you've probably been using since you were a wee little thing, still counting coppers. Despite this experience, there may still be a few things about the system that you might not know, and these tricks will help you buy smart and sell with confidence.
i. Price per item
When asked what the focus of my public school math classes were, the first thing that comes to mind is grocery store navigation. Seriously. I'm pretty sure that we spent an ample amount of time, spread out over the years, working on making change, understanding tax, and learning that price per unit (such as $1 per pound) is sometimes convoluted in order to trick us into parting with more cash.
When looking at the basic, unmodified Auction House, you can quickly determine which stacks of cloth are selling each piece for the cheapest. This is easy to do when looking at several stacks of 20, but often, there are several partial stacks for sale as well, and sometimes you can actually get a bargain by snatching those up. Other times, they're priced at a huge mark-up!
Mouse-over the icon for the item, and the tooltip that appears will tell you the Bid Price Per Unit and the Buyout Price Per Unit. In seconds, you'll be able to tell what to bid on, what to buy out, and what to avoid.