USA has two types of workers - college graduates (CG) and drop-outs (D) - and one type of capital - computers. College graduates work with computers to write books and dropouts work with computers to fill forms. Dropouts cannot be used to write books and college graduates do not fill forms.

If we are to use a specific factor model, which of the three factors mentioned above (college graduates, dropouts, and computer) are/is the specific factor(s) and which are/is the homogenous factor(s)?