When products are listed in category pages, it is not possible to show the actual price of the product on that category listing of products. But there are a couple of pieces of product information can be shown there.
TEASER PRICE: Each product has a Teaser Price setting. Edit any product under Catalog > Products on your site, and at the top-right of the product's General settings tab, there is a Teaser Price field. A value entered there will be shown when the product is listed on a category page.
SHORT DESCRIPTION: Each product also has a Description tab that has areas for Long Description and Short Description. Anything entered in the Short Description tab will be shown if the product is being listed on a category page.