Split up the category links on your details page and increase your internal linking structure. Normally if a user submits to the category "Business » Investing » Other", the details page will display a single link back to that category. Install this mod and instead, your details page will generate a link for each sub category. One for "Business » Investing » Other", one for "Business » Investing" and one for "Business"!

Developed and tested with phpLD v3.1.0, v3.2.0 and v3.3.0