Many Americans regularly drive their own cars to work rather than use public transportation or form a carpool.

1) How do you know that each person in a single-passenger vehicle during rush hour is behaving efficiently?

2) The people riding the bus are also behaving efficiently how can (a) and (b) both be true simultaneously?

3) What is actually being asserted by someone who says that it's inefficient for so many commuters to take their own cars to work?