On Kantorovich problems with a parameter

In this note, we study the Kantorovich problem of optimal transportation of measures on metric spaces in the case where the cost function and marginal distributions depend on a parameter from a metric space. It is shown that the Hausdorff distance between the sets of probability measures with given marginals can be estimated by the distances between the marginals. As a corollary, it is proved that the cost of optimal transportation is continuous with respect to the parameter if the cost function and marginal distributions are continuous in this parameter.