The Enron scandal was an accounting scandal involving Enron Corporation, an American energy company based in Houston, Texas. Upon being publicized in October 2001, the company declared bankruptcy and its accounting firm, Arthur Andersen then one of the five largest audit and accountancy partnerships in the world was effectively dissolved. In addition to being the largest bankruptcy reorganization in U.S. history at that time, Enron was cited as the biggest audit failure.

Enron was formed in 1985 by Kenneth Lay after merging Houston Natural Gas and InterNorth. Several years later, when Jeffrey Skilling was hired, Lay developed a staff of executives that by the use of accounting loopholes, special purpose entities, and poor financial reporting were able to hide billions of dollars in debt from failed deals and projects. Chief Financial Officer Andrew Fastow and other executives misled Enron's board of directors and audit committee on high-risk accounting practices and pressured Arthur Andersen to ignore the issues.

Enron shareholders filed a $40 billion lawsuit after the company's stock price, which achieved a high of US$90.75 per share in mid-2000, plummeted to less than $1 by the end of November 2001.[2] The U.S. Securities and Exchange Commission (SEC) began an investigation, and rival Houston competitor Dynegy offered to purchase the company at a very low price. The deal failed, and on December 2, 2001, Enron filed for bankruptcy under Chapter 11 of the United States Bankruptcy Code. Enron's $63.4 billion in assets made it the largest corporate bankruptcy in U.S. history until the WorldCom scandal the following year.

Many executives at Enron were indicted for a variety of charges and some were later sentenced to prison, including Lay and Skilling. Arthur Andersen was found guilty of illegally destroying documents relevant to the SEC investigation, which voided its license to audit public companies and effectively closed the firm. By the time the ruling was overturned at the U.S. Supreme Court, Arthur Andersen had lost the majority of its customers and had ceased operating. Enron employees and shareholders received limited returns in lawsuits, despite losing billions in pensions and stock prices.

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B. Identify and explain the Agency costs types that could emerge based on this case.