Last week we highlighted the McKinsey Quarterly's report on companies that made great leaps in innovation during the Great Depression. Hewlett-Packard, Polaroid, and DuPont were noted examples. But what about start-ups and small business? Does entrepreneurship take a nap during recessions? The Kauffman Foundation looked companies that went public every year from 1901-2006 and found some noted names. A cross-section of successful public companies were founded during recessions, including such recent examples as Genentech, Microsoft, Southwest Airlines, Genzyme, and many others. And prominent companies being founded during a recession are not just a recent phenomenon, with Morgan Stanley, Allstate, Krispy Kreme, and Knoll, among others, all able to trace their founding dates to the Great Depression. More generally, the report found that there wasn't much of gap between the number of companies started during recession years and the number started during years of economic expansion years. Over that full period, an average of 70 companies were founded per year during recessions, compared with 83 during expansion. And looking at the data for all years after World War II, the gap is nonexistent: On average, 138 companies went public during each year of economic expansion, while 140 companies went public during years of recession. This report isn't extensive enough to draw firm conclusions, but at the very least it shows, as does the McKinsey article, that there are opportunities during down periods. The relationship between when a company is founded and its eventual success is little-explored, but interesting and important. Should we expect fewer companies of lasting significance to be founded during economic downturns? Or, should we expect that tough economic times produce quality companies in similar numbers as other periods? The answers to these questions touch on issues in policy, economics, and entrepreneurship research. While the research summarized in this short paper is only preliminary, it suggests some possible early answers. Knowing that a company was successful-at least as evidenced by having gone public-does not give us any information about whether that company was founded during a recessionary or non-recessionary period. At least in a general sense, that is suggestive in that, given smaller numbers of companies founded during recessionary periods, the implication is that companies founded in such times have a higher likelihood of turning out to be economically important. A good next step would be to look at key shared characteristics between successful companies started in periods of recession. Read the full Kauffman report here .