behavioralassumptions: (i) herd behaviour; (ii) a-synchronous updating ofbeliefs; and (iii) heterogeneity in time horizons (memory …,1$) innovations, and predicts a relation between the ARCH and GARCH coefficients. Heterogeneity in memory leads to long …

. Alternative models of expectations formation are reviewed and the importance of allowing for heterogeneity of expectations is …

-sectional (N) and time (T) dimensions and varying degrees of parameter heterogeneity. We investigate conditions under which panel … accuracy depend on the degree of parameter heterogeneity, whether heterogeneity is correlated with the regressors, the goodness …