Although trading companies such as Goldman Sachs and Merrill Lynch used the conventional "agent model" for reporting revenue (where only the trading or brokerage fee would be reported as revenue), Enron instead elected to report the entire value of each of its trades as revenue. This "merchant model" was considered much more aggressive in the accounting interpretation than the agent model. Enron's method of reporting inflated trading revenue was later adopted by other companies in the energy trading industry in an attempt to stay competitive with the company's large increase in revenue. Other energy companies such as Duke Energy, Reliant Energy, and Dynegy joined Enron in the largest 50 of the revenue-based "Fortune" 500 owing mainly to their adoption of the same trading revenue accounting as Enron.