Pricing policies at any shopping site does the firm use psychological pricing?product line pricing? any pricing strategies you can identiify. do you prefer the site over a competitor's site?
I think a lot of bargain sites like Ebay or Overstock (among countless others) use the psychology of sales pricing greatly to their advantage. They will list something as 50% off of retail, and the customer purchases it thinking it is an incredible bargain.
Often times, however, the product is a year old and could be purchased in a store for 30-40% off. When shipping is factored in it really isn't that much of a bargain, but people bought in because they "saved" 50% off of the suggested retail price that might not have ever been used in the first place.
Lots and lots of sites use psychological pricing even though there is disagreement as to whether that actually works. For example, Dell Computers has all the prices for its various specials ending in the numeral 9. This is a classic psychological pricing method as people are believed to prefer prices that do not reach the next "round number" ($499 is seen as better than $500, etc).
I tend to shop exclusively at Amazon. The only items I buy on-line are books. This site offers the same book, in different conditions, at different shipping costs (sometimes). This way, if the condition of the book is not my main concern, I will normally purchase the cheapest copy. Psychologically, I like to see the amount I save over purchasing a new book.
Was there a particular firm or website in question that you wanted us to look at, or were you just talking in general?