Total social value is still increased even if John steals the apple.

	Before . . .	After John steals the apple, paying $0
Mary values the apple at $.50	==$x +   = $x + $.50	$x
John values the apple at $1	$y	=== $y +  = $y + $1
Total social value	$x + $y + $.50	= $x + $y + $1

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