Forum Moderators: buckworks
Don't distract from the real purpose of the shopping cart page which is "CLICK ON THE CHECKOUT BUTTON"
But always add:
A) accessories for items already in cart
B) low cost impulse buy items that may qualify them for discounts (free shipping on orders over $100 for example)
C) category related items compared to cart contents
D) people who bought those - also bought these
E) Top selling items in general
in that order.
Some merchants go so far as throwing those items at you at the checkout confirmation page. I'm sure it works, but I personally prefer not to distract customers with bling bling at such a crucial point in the transaction. But the shopping cart page itself is good as it is earlier on.
We have had good success with upselling by offering free shipping for orders over $x and if the customer has not added that value of goods to the cart yet, we display a number of related upsell items that they can choose from to reach the minimum order level for free shipping. Has worked extremely well.
For example, our cart will allow you to manually specify certain related items, then fill the remaining slots with calculated related items.
Across our merchant base, we see about 20% - 25% more related item adds when a merchant uses both manual & calculated related item display.
Of course, this only works well when you've some historical data to work with. :-)
If you only send them to the cart when it is actually checkout time, then keep it clean.
Never forget that the most important element on the cart page is that "CHECKOUT!" button. Always make it the focus and most prominant element.