Using Switzerland as a paradigmatic case, the ratio of CEO pay to the worker with lowest pay increased from 6x in 1984 to 43 x in 2011 (source: The Guardian).
What specific policy or policies have either allowed or/and promoted such a jump?
This question has seen a massive amount of research. It appears that the question of the cause of increased CEO pay is not settled and there are many competing theories. Here are a few which I've found:
This argument, put forward in Why Has CEO Pay Increased So Much? (2006) by Gabaix and Landier, attributes the increase to increased market capitalization:
The sixfold increase of CEO pay between 1980 and 2003 can be fully attributed to the six-fold increase in market capitalization of large US companies during that period. We find a very small dispersion in CEO talent, which nonetheless justifies large pay differences. The data broadly support the model. The size of large firms explains many of the patterns in CEO pay, across firms, over time, and between countries.
The increase in market capitalization is of course caused by the large number of mergers and acquisitions. However, this argument has been disputed. See for example Understanding Piketty's Capital in the Twenty-First Century (p. 138) by Pressman:
Another counterargument to Gabaix and Landier is that CEO salaries are not rising to the same extent everywhere in the world. The extremely sharp increase in CEO pay in the US has not been replicated in Japan or in most of Europe; but CEOs have taken on more responsibilities and are doing more regardless of where company headquarters are located.
An earlier article The effects of ownership structure on conditions at the top: The case of CEO pay raises (1995) by Hambrick and Finkelstein found:
In management-controlled firms—where no single major owner exists—results suggest an overarching pay philosophy: maximize CEO pay, subject to demonstration of face legitimacy of that pay. In externally-controlled firms—where a major (nonmanager) owner exists—results suggest a very different philosophy: minimize CEO pay, subject to the ability to attract/retain a satisfactory CEO.
Implying that changing ownership structure of firms is responsible for the increase in CEO pay.
It makes sense to reason that if there is a scarcity of qualified CEOs then their compensation must increase. In Why Is CEO Pay Rising? Maybe There Aren’t Enough Good CEOs Donatiello, Larcker and Tayan argues that this might be the case:
Perceived scarcity of talent is likely driving pay higher. A tight labor market for CEO talent might help to explain high compensation levels, particularly among the largest U.S. companies. If only a limited number of executives are qualified to run these companies—and if outstanding CEO talent is critical for their success—then it is reasonable to expect that boards will offer large sums of money to attract their top candidate or retain their current CEO.
The idea is that board members and others who controls CEO pay believes that qualified CEO talent is scarce and that it therefore must be compensated royally. Normally this situation would be regulated by the Law of the supply and demand - rising pay should lead to a larger pool of qualified talent, moderating compensation growth. The authors speculate that this does not occur because the "labor market for CEO talent might be inefficient."
In the 1960s and 1970s, most Western countries had very progressive tax rates meaning that high income earners paid a larger fraction of their income in taxes than low income earners. Reaganomics and neo-liberal thinking changed that and today most tax systems are much less progressive. In fact, many tax systems are today strongly regressive, meaning that the top pays less in income tax than the median earners.
According to Thomas Piketty in his best-selling book Capital in the Twenty-First Century (pp. 655-656) there is a casual link between lower marginal taxes and higher CEO pay:
It is always difficult for an executive to convince other parties involved in the firm ... that a large pay raise ... is truly justified. In the 1950s and 1960s, executives in British and US firms had little reason to fight for such raises, ..., because 80–90 percent of the increase would in any case go directly to the government. After 1980, the game was utterly transformed, however, and the evidence suggests that executives went to considerable lengths to persuade other interested parties to grant them substantial raises. ... top managers found it relatively easy to persuade boards and stockholders that they were worth the money, especially since the members of compensation committees were often chosen in a rather incestuous manner.
Our [Thomas Piketty, Emmanuel Seaz and Stefanie Stantcheva] findings suggest that skyrocketing executive pay is fairly well explained by the bargaining model (lower marginal tax rates encourage executives to negotiate harder for higher pay) ...
Finally, we found that variations in the marginal tax rate can explain why executive pay rose sharply in some countries and not in others. In particular, variations in company size and in the importance of the financial sector definitely cannot explain the observed facts.
Thomas Piketty in Capital (pp. 419-420) argues that CEO pay has sky-rocketted because executives have the power to set their own salaries:
It is only reasonable to assume that people in a position to set their own salaries have a natural incentive to treat themselves generously, or at the very least to be rather optimistic in gauging their marginal productivity. To behave in this way is only human, especially since the necessary information is, in objective terms, highly imperfect. It may be excessive to accuse senior executives of having their "hands in the till," but the metaphor is probably more apt than Adam Smith's metaphor of the market's "insivible hand."
According to him, CEO pay is largely driven by "societal norms":
Each society also imposes certain social norms, which affect the views of senior managers and stockholders ... as well as of the larger society. These social norms reflect beliefs about the contributions that different individuals make to the firm’s output and to economic growth in general.
Without a theory of this kind, it seems to me quite difficult to explain the very large differences of executive pay that we observe between on the one hand the United States ... and on the other continental Europe and Japan. Simply put, wage inequalities increased rapidly in the United States and Britain because US and British corporations became much more tolerant of extremely generous pay packages after 1970. Social norms evolved in a similar direction in European and Japanese firms, but the change came later (in the 1980s or 1990s) and has thus far not gone as far as in the United States.
Of what I can find, it appears that the theory that CEO pay is driven by increased demand for CEO talent, this is, that CEO pay is "fair," is discredited. See for example the report CEO compensation surged in 2017 (2017) by Mishel and Schieder:
The argument that CEO compensation is being set by the market for “skills” does not square with the data. Bivens and Mishel (2013) address the larger issue of the role of CEO compensation in generating income gains at the very top and conclude that substantial rents are embedded in executive pay. According to them, CEO pay gains are not the result of a competitive market for talent but rather reflect the power of CEOs to extract concessions.
Another discredited theory is that CEO compensation is linked to company performance. See for example The Link between CEO Compensation and Performance (2011) by Nilsson and Tärnbo:
Our main finding ... is that CEO compensation in our data set is not related to our relative performance measure. We obtain a negative relationship between compensation and the relative performance ... It seems like compensation is not determined according to the agent-principal theory, ... Instead accounting measures such as EPS and other factors, e.g. market capitalization and bonus ratio play a vital part in determining the compensation levels for the CEOs studied.
Meta I reject the notion that CEO pay would be a non-political issue. Clearly, compensation is seen as the premier measure of the value of a persons work. One corroborating reason for higher CEO pay is likely that we as society nowadays tend to value their work higher. But why do we do that? Unless CEO pay is justified by market factors, economy alone cannot answer that question. Hence it is a question of politics.
There are many reasons but mostly due to changes in corporatisation culture and deregulation. Bad CEO can now "rewards" themselves even they are doing a terrible job, as long as the activist shareholder allow them. There are tons of reason that
activist shareholder pay millions for a CEO to intentionally run it down for the quick profit for those shareholder. A common tactics is "share buy back" by exhausting the company cash by the CEO, while the activist shareholder can reap the profit from non-production stock jack-up even it will definitely jeopardize the company in long run.
While another way round is about how the CEO pick their board, to make sure the shared looting went unchecked, like in Enron case.
In the year prior to its December 2001 bankruptcy filing, Enron handed out $745 million in payments and stock awards to 144 of its senior executives. The company disclosed that these executives received $310 million in salary, bonuses, loan advances and other income. $435 million came in the form of exercised stock options and restricted stock packages. These figures include the $54.6 million in retention bonuses that were given to 200 executives in the days immediately preceding the declaration of bankruptcy.
Why all this happens, perhaps this transcript of Noam Chomsky interviewed by Laura Flanders shed some light.
LF: But you hear it all the time that under law, the CEO’s required to increase dividends to shareholders.
NC: It’s kind of a secondary commitment of the CEO. The first commitment is raise your salary. One of the ways to raise your salary sometimes is to have short-term profits but there are many other ways.
In the last thirty years there have been very substantial legal changes to corporate governance so by now CEOs pretty much pick the boards that give them salaries and bonuses. That’s one of the reasons why the CEO-to-payment [ratio] has so sharply escalated in this country in contrast to Europe. (They’re similar societies and it’s bad enough there, but here we’re in the stratosphere. ] There’s no particular reason for it.
Stakeholders — meaning workers and community – the CEO could just as well be responsible to them. This presupposes there ought to be management but why does there have to be management? Why not have the stakeholders run the industry?
High CEO pay is caused by competition between large corporations for their skills, because they make those corporations lots of money
Being a CEO requires a lot of skills and experience that most people do not have. A successful CEO can potentially make a corporation many millions or billions of dollars more than it otherwise would have made, especially in terms of stock valuation. During the same period you mention in the question, the value of stock markets pretty much everywhere also increased by about the same amounts.
If CEO decisions can make a company hundreds of millions of dollars more than it otherwise would have made, then it’s a no-brainer to pay that person tens of millions of dollars a year. That is especially true if you want to stop that guy from working for one of your competitors.
What specific policy or policies have either allowed or/and promoted such a jump?
This is like asking “what specific policy or policies have either allowed or/and promoted Pokémon?” It presumes that the world is a tightly controlled and well-understood place, so anything strange that might happen is the product of some deliberate design that can be adjusted simply by changing a very specific law that must have allowed it to happen. That is not the case. In reality, the world is full of all sorts of behavior that emerges unexpected from a variety of factors that don’t involve a master plan enacted through specific government policy.
My actual attempt to answer that question is to say “all of the policies that allow corporations to make large sums of money,” but that’s not very specific. It’s impossible to give an answer that is both specific like you want and accurate, because this situation isn’t the result of a set of discrete policy decisions.