“…It has since been extended by Turnovsky (1982), Bhandari (1985), and Edison and Vaardal (1990), and it typically implies that the optimal weights are changing over time with macroeconomic fundamentals. Conversely, the financial literature on basket regimes usually assumes fixed weights; see Graf von der Schulenburg (1984), Horngren and Vredin (1989), Klein (1989), and Pikkarainen (1991).…”