The revolving door is the movement of people between government posts and the industries those posts oversee. Everyone agrees the door exists. The harder questions are what it actually does to decisions, and whether rules to slow it help or hurt.
Three explanations
The first explanation is the deferred reward: an official goes easy on firms in the hope of a well-paid job later. No contract is signed and no money changes hands while the official is in office, which makes the arrangement almost impossible to prosecute. The second explanation runs the other way. Some economists argue that a tough record can advertise an official's skill to future employers: a prosecutor who wins hard cases against banks proves exactly the expertise banks will later pay for. On this view the door may make regulators sharper, not softer. The third explanation is connections. Firms may hire former officials less for their knowledge than for access to former colleagues still inside government.
What the evidence shows
Separating these stories is hard, but researchers have found clever tests, helped by disclosure laws that make lobbyists report their clients and fees. Jordi Blanes i Vidal, Mirko Draca and Christian Fons-Rosen studied lobbyists who had once worked as staff for US senators. When the senator a lobbyist had worked for left office, that lobbyist's revenue fell by about 24 percent, roughly a quarter. Their knowledge of policy had not changed overnight; their direct line to a powerful office had. The study, published in 2012, suggests that connections, not only expertise, are much of what clients buy.
Other evidence cuts the other way. A 2015 study of lawyers at the US Securities and Exchange Commission found no sign that those who later moved to private law firms had been softer on the companies they investigated, and some sign that they had been more aggressive. The door's effects seem to depend on the job, the agency and how visible the official's record is.
"Descent from heaven" in Japan
Japan gave the practice a memorable name: amakudari, or "descent from heaven." Senior bureaucrats, often eased into early retirement by a strict seniority system, take senior posts in firms and public bodies their ministry once oversaw. Critics blamed the practice for cozy ties between ministries and industries such as construction, banking and nuclear power. Reforms around 2007 and 2008 barred ministries from arranging jobs for their retirees. In 2017 the education ministry was found to have kept arranging them anyway, and its top civil servant resigned.
Defenders of amakudari argued that it let experienced officials pass their knowledge to the private sector, and that it allowed ministries to pay modest salaries in exchange for a secure later career. Critics answered that a ministry which places its retirees in a company has every reason to treat that company gently, and that the companies understood this perfectly well.
The minister and the hidden account
France has its own word, pantouflage, from the French for slipper, for elite civil servants who leave the state for comfortable private posts. A scandal sharpened French rules. Jérôme Cahuzac, the budget minister who led the government's campaign against tax fraud, resigned in March 2013 and in April admitted to a hidden foreign bank account he had denied for months. He was later convicted. In response France created the High Authority for Transparency in Public Life, an independent body that checks officials' asset declarations and, since 2020, their moves into private business.
Cooling off, and its costs
Most democracies now impose waiting periods. Under a 2007 American law, former senators must wait two years before lobbying Congress, and former House members one year. The European Union tightened its rules after José Manuel Barroso, president of the European Commission until 2014, joined Goldman Sachs in 2016. An ethics committee found he had broken no rule then in force, but public anger was intense, and in 2018 the Commission lengthened its cooling-off periods, to three years for former presidents and two for other commissioners.
Such rules have costs. They may deter skilled people from public service, and they invite shadow lobbying: influencing officials without registering as a lobbyist, for example by working as a "strategic adviser." A rule that only moves the activity out of sight can leave the public worse informed than before. Supporters answer that a delay still cools the most valuable contacts, because the people a former official knew best have often moved on by the time it ends.
Worked example
A national drug regulator's head of approvals leaves to become a vice president at a pharmaceutical company whose drug she approved last year. Which explanation fits? If the approval was unusually quick and rested on thin evidence, the deferred reward story gains weight. If she had a record of rejecting the company's other drugs, the skill story fits better: the company hired its toughest critic. If her new job description is mostly "government relations," the connections story is likely. A cooling-off rule would delay her lobbying her old agency, but it would not stop the company's other employees from asking her whom to call.