Great Depression was a global phenonmeon, so it should be understood globally. Barry Eichengreen, economic historian at UC Berkeley, compares two depressions then (Great Depression, 1929-33) and now (call it "half-Great-Depression"). Source: VoxEU.
Figure 1. World Industrial Output, Now vs Then
Source: Eichengreen and O’Rourke (2009).
Figure 2. World Stock Markets, Now vs Then
Source: Global Financial Database.
Figure 3. The Volume of World Trade, Now vs Then
Sources: League of Nations Monthly Bulletin of Statistics, http://www.cpb.nl/eng/research/sector2/data/trademonitor.html
Policy responses: Then and now
Figure 4 shows a GDP-weighted average of central bank discount rates for 7 countries. As can be seen, in both crises there was a lag of five or six months before discount rates responded to the passing of the peak, although in the present crisis rates have been cut more rapidly and from a lower level. There is more at work here than simply the difference between George Harrison and Ben Bernanke. The central bank response has differed globally.
Figure 4. Central Bank Discount Rates, Now vs Then (7 country average)
Source: Bernanke and Mihov (2000); Bank of England, ECB, Bank of Japan, St. Louis Fed, National Bank of Poland, Sveriges Riksbank.
Figure 5 shows money supply for a GDP-weighted average of 19 countries accounting for more than half of world GDP in 2004. Clearly, monetary expansion was more rapid in the run-up to the 2008 crisis than during 1925-29, which is a reminder that the stage-setting events were not the same in the two cases. Moreover, the global money supply continued to grow rapidly in 2008, unlike in 1929 when it levelled off and then underwent a catastrophic decline.
Figure 5. Money Supplies, 19 Countries, Now vs Then
Source: Bordo et al. (2001), IMF International Financial Statistics, OECD Monthly Economic Indicators.
Figure 6 is the analogous picture for fiscal policy, in this case for 24 countries. The interwar measure is the fiscal surplus as a percentage of GDP. The current data include the IMF’s World Economic Outlook Update forecasts for 2009 and 2010. As can be seen, fiscal deficits expanded after 1929 but only modestly. Clearly, willingness to run deficits today is considerably greater.
Figure 6. Government Budget Surpluses, Now vs Then
Source: Bordo et al. (2001), IMF World Economic Outlook, January 2009.