 In the economy, the amount produced depends in part on how production will be allocated, at least insofar as people respond to incentives (see the entry on  distributive justice).  For instance, a guaranteed equal share gives no self-interested incentive to work hard or in an efficient job. In organ transplantation, the number of organs available also depends on how they would be allocated. In the economy, ideal allocation principles may have to yield to the reality of incentives, which is why it is often thought that strict equality is precluded by concern for efficiency. Similarly, transplantation seems to face a choice; it can keep its ideal principles and have fewer organs or compromise them and have more. Some examples discussed here are live donation, kidney exchanges, directed deceased donation, priority to donors, and priority to children. These examples are diverse so one cannot straightforwardly tell whether practice in one is consistent with practice in another. Nonetheless, they have in common the question: what if the usual principles of allocation led to fewer organs being donated than would deviating from those principles? That they have this question in common has not been widely appreciated, which may explain why the question has been answered in different ways in the examples described below.