Jacob is imaginative, creative, and seeks out new experiences. sean is hardworking, ambitious, neat, and prides himself on never giving up until a task is finished. in terms of the five-factor model, jacob would probably score high on the dimension of while sean would probably score high on the dimension of

Jacob would score high on the Openness to New Experiences domain because he is creative, open to new experiences, and imaginative.  Sean would score high on the dimension of Conscientiousness.  Because he is neat, organized, and ambitious.  The other dimensions are Extroversion, Agreeableness, and Neuroticism. 

Complementary goods. they go together, thats why one price increase and the others demand increases