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In order to focus clearly upon the operation of this one force, which we may call the effect of `` public-limit pricing '' on `` key '' wage bargains, we deliberately simplify the model by abstracting from other forces, such as union power, which may be relevant in an actual situation.

For expository purposes, this is best treated as a model which spells out the conditions under which an important industry affected with the public interest would find it profitable to raise wages even in the absence of union pressures for higher wages.