¹(Oatley and Johnson-Laird, 1987; Van Boven, 2005; Heathwood, 2015); cf. Diotima in Plato’s Symposium: “[T]he happy are made happy by the acquisition of good things”. For a discussion of different definitions of “well-being”, which can be seen as equivalent to happiness here, see Crisp (2017); Fletcher (2015).