Have you seen a study about money feeling more valuable when you earn it through physical labor?

I know it sounds stupid, but I recently saw an article on this. Researchers found that, dollar-for-dollar, money was seen as more valuable to a person who actually had to engage in physical labor to earn it as opposed to someone who did light office or phone work to earn it.

I saw this article on a fairly major news site within the last month, but I am having no luck finding it. Obviously, this is a pretty complex thing to enter into a Google search, and the key terms are pretty generic.

Does anyone know where I can find a link to the study itself or an article about it? Please help!