The Staffordshire coalowner would benefit, because he would be saved from the competition of the Lancashire coalowner, but what would the Lancashire coalowner say if he were charged a prohibitive rate with regard to the London market?

In case A, O-O-O is pretty much ironclad safe for Black; the c-file is full open, but a single line does not a successful attack make (unless defensive forces are congested, but Black's strength points Queenward), and there is no way, if Black's a and b pawns are unmoved, for White to force open any additional lines (3v3 can open a file by force, but 2v2 cannot).

She never reproached me with her mouth, not once, but she reproached me with her eyes.

We have caught many fine stringsful in that manner.