Anchor: This petty little business, as you call it, bears directly on a very big business, bigger perhaps than either you or Miss Tuppence know.
Entailed: You obviously have no idea how big this business is. 
Contradiction: Your idea of this business is exactly how you describe it. 
Contradiction: Suburban carriers make more than city ones
Contradiction: It doesn't really matter to suppliers and consumers whether or not it is technically the best.
Contradiction: The children dress for school.
Contradiction: Girls playing soccer.