Salary versus Equity
I think that a very solid line should be drawn between those who are paid a salary regardless of whether they perform excellently, adequately or badly
And those who founded a business and own some or all of the equity in that business.
Frankly, I don't see much evidence that many (any?) of the fat cats paid six- or seven-figure salaries are worth any more than the employees several levels below them. Indeed, it's usually the lower levels that do the real work, and can see how the self-perpetuating clique of fat cats more often than not have zero or negative value. They give themselves 10% or 20% pay rises, while the staff that do the work get 0%. They aren't working for a living, they are parasitising those who do!
In contrast, someone who put his own money and time into a business that is now thriving, should be allowed to enjoy whatever degree of success he is able to achieve, just as long as it is by way of dividends paid equally to all equity-holders, or sale of shares in that equity.
So (for example) I'd be in favour of higher levels of income tax on very large salaries, but not the same levels on capital gains (especially not on long-term capital gains, and especially not capital gains made by founders of businesses on equity that was worth nothing at all when they started). Anti-avoidance rules would clearly be needed to stop the fat cats playing the system.
Also there should be an outright ban on any salary greater than the Prime Minister's salary in any part of the public sector (including universities, quangos and suchlike -- not just the civil service). If a corporation wastes its money, it will sooner or later go bust. That's a crude self-correcting mechanism that eliminates the very worst excesses. Whereas if an organisation is funded by the taxpayer, its fat cats can and will carry on leeching off society effectively forever. (In the rare cases where such an organisation needs a specialist who really can command such a large salary in a free market, it should obtain that service by competitive tender, with payment under the laws governing commercial contracts, including appropriate penalty clauses. Never by employing that specialist on a salary. )
Controversial, I know. Asbestos jacket in place ....