I was looking at your suggestion for adding code to the stylesheet,
.productListing-data {border-bottom: 1px solid; padding: 1em 0 1em 0;}
but I found where the HR definition is described and that's what's apparently used for the All Products and New Products pages. Since I'm not sure which pages the .productListing data affects, I'm afraid I'll get an extra line below the listings on the two pages that already have the HR.
I would prefer to find where the HR could be added to the "Market Reports" category listing page so that it has the same formatting as the other two pages.
Thanks for all your suggestions. And my apologies for being such a novice at this. I don't really know much PHP and am something of a beginner at CSS as well (though I have managed to use it to customize our site).
Dana