There are a lot of articles on the value of marketing in a recession. Most of these were written around three recessions: 1982; 1991; and 2001. These recessions ranged from severe (1982) to mild (1991 and 2001). The current "downturn" is definitely a "severe recession"--the question is, is it a depression? I'll set the following rules, somewhat arbitrarily, about separating a recession from a depression. A depression must satisfy 4 of the following 5 conditions: Negative GDP growth for at least eight consecutive quarters Unemployment > 10% Stock market down > 50% from peak Real Estate values down > 40% from peak Deflation in corp CPI for at least two consecutive quarters So, using my definition above, which probably passes a sniff test and little else, are we in a depression? We'll have to use probabilities, because these data aren't complete yet. Negative GDP growth for at least eight consecutive quarters. We're at three now.…