Myopia is often the problem of the fun-loving, free-spending grasshopper; inertia can strike the responsible ant as well—particularly later in life, when the dutiful saver must suddenly crack open the nest egg they’ve so diligently built up. Behavioral economists understand that just because something is rational to do—in this case, switching from saving to “dissaving”—that doesn’t mean people will do it easily. Inertia is a very powerful force. As economists Hersh Shefrin and Richard Thaler once put it, “It is hard to teach an old household new rules.”
