in order to restore the balance ... but we want any such exercise to be limited to what is
corresponding and not to be used in a punitive way." In other words, political expectations
under the bargain are protected by a rough equivalent of expectation damages, but nations are
disabled from insisting on more -- any greater level of retaliatory withdrawal would raise the
price of nonperformance above the costs to the disadvantaged promisees and thus discourage
efficient nonperformance.