When you take an airline flight, the passenger sitting next to you tries to have a conversation with you. This person asks, $$What do you do$?$ You would like to be nice, but don$$t want to give too much information about yourself $($such as your name$).$ A typical US manager may say: $$I am a marketing manager$$without mentioning the employer. A typical Japanese manager may say: $$I work for Honda.$$

a$.$ How would you answer this question?

b$.$ Why are there such differences?