In a remarkable illustration of the power of lobbying in Washington, a study released last week found that a single tax break in 2004 earned companies $220 for every dollar they spent on the issue -- a 22,000 percent rate of return on their investment. The study by researchers at the University of Kansas underscores the central reason that lobbying has become a $3 billion-a-year industry in Washington: It pays. The paper by three Kansas professors examined the impact of a one-time tax break approved by Congress in 2004 that allowed multinational corporations to repatriate" profits earned overseas, effectively reducing their tax rate on the money from 35 percent to 5.25 percent. More than 800 companies took advantage of the legislation, saving an estimated $100 billion in the process, according to the study. The largest recipients of tax breaks were concentrated in the pharmaceutical and technology fields, including Pfizer, Merck, Hewlett Packard, Johnson & Johnson and IBM. Pfizer alone repatriated $37 billion, representing 70 percent of its revenue in 2004, the study found. The now-beleaguered financial industry also benefited from the provision, including Citigroup, J.P. Morgan Chase, Morgan Stanley and Merrill Lynch, all of which have since received tens of billions of dollars in federal bailout money. The researchers calculated an average rate of return of 22,000 percent for those companies that helped lobby for the tax break.