Linking External Sector Imbalances and Changing Financial Instability before the 2008 Financial Crisis

Here we focus on the external sector component of financial instability and link changes in country imbalances to individual economy growth rates in ways when summed across countries produce indices of expected worsening or improving financial instability at different points in time. We compute a variety of such indices for the years immediately before the 2008 Financial Crisis. We use the sum of the absolute value of external sector imbalances across countries (the trade imbalance, or the current account imbalance) as a proportion of the combined GDP of countries and link them in various ways to country growth rates. An increasing measure under an index is an indication of future widening excess demands and supplies over all countries as a group relative to gross world product. This, in turn, is an indication of increasing severity of adjustment problems ahead, and hence expected worsening financial instability. We compute such indices for all G20 countries, and various subsets of countries (G2, G8, G8+5) and examine their behavior over the period 2004-2007