“…11 See Backus, Gregory, and Zin (1989), Donaldson, Johnsen, and Mehra (1990), Den Haan (1995), and Chapman (1997) and to a full second-order approximation around the steady state (Hördahl, Tristani, and Vestin, 2006b) are only moderately more successful, because they imply that all risk premiums in the model are constant (in other words, these authors all assume the weak form of the expectations hypothesis). Obtaining a local approximation that actually produces time-varying risk or term premiums requires a full third-order approximation, as in our analysis above and in Ravenna and Seppälä (2006).…”