This paper develops a model of bequeathing based on a moral hazard type of argument. This model explains why altruistic patents prefer late bequests to early inter-vivos gifts; it also analyzes whether or not they ought to leave rather equal bequests to their children even when the children end up with quite different incomes.
Cremer, H., & Pestieau, P. (1998). Delaying inter vivos transmissions under asymmetric information. Southern Economic Journal, 65(2), 322-330. https://doi.org/10.2307/1060671 (Original work published 1998)